Worgen druid forms 
why cats?
Worgen and modern druidismā¦ is an interesting thing, and Toranis isnāt far off here. It all goes back to the controlling nature of the Cenarion Circle, and their common core 
curriculum. As you might recall from Curse of the Worgen, the worgen came first, and the Cenarion Circle was actually founded by Malfurion to make sure no one could use druidism in a way he sees as incorrect ever again. The Circleās conquest to control druids worldwide has been an ongoing story, as they slowly absorb more and more previously independent sects of druids into their fold over time. In Warcraft III, it was the Druids of the Talon and Druids of the Claw. In Cataclysm, they took in the Harvest Witches. In Legion, they found the Druids of the Fin, Antler, and The Ashen. On one hand, this is great that they have an order to follow. But on the other hand, this isnāt lead by a council, this is
Cenarion teachings
To be fair to the Circle though, many of these groups have become more powerful and skilled as a result of it, such as the Harvest Witches like Celestine of the Harvest becoming āInconspicuous Bearsā, and more mulgore tauren and darkspear trolls becoming skilled druids as well. The question is, if the Circle has banned one form, and the reason of their founding was to restrict and teach their own style of druidism, how many rules and laws do they have in place now? How many Harvest Witch, Tauren, or Troll practices are they expected to leave behind? Ingame, we see the trolls have a degree of freedom since they earn their flight form from Hiāreek and not Aviana, but besides that there appears to be scarcely little in terms of cultural variety.
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āThe War of the Satyr had taken its roll on the kaldoriei, still struggling to reshape their ancient culture after the sundering. But it was, despite that, a time of innovationā¦ when druids had a passion to experiment with new forms, learnign what they were truly capable of. Regardless, Malfurion Stormrage had begun to restrict the druidsā freedom and establish boundaries, limiting the great potential of his flockā¦ the wise amongst them spoke out.ā - Alpha Prime, Curse of the Worgen, issue 1.
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The [worgen origins] forced Malfurion to reflect on the state of druidism. Without some form of regulation, he concluded that individuals like Ralaar would inevitably go too far in their application of druidic power. Malfurion and his followers therefore created the Cenarion Circle, a harmonious order that would guide and keep watch over the worldās druids and their practices. The Cenarion Circleās first great task was to deal with the worgen threat. - Chronicle 1, loc 2058
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āIf these Druids of the Scythe have shown us anything, brothers, it is that our great power comes with a price. We must establish a way for our practice. We have experimented long enough to know the truths of each form. I have consulted with Cenarius. And it is with his blessing that I establish the Cenarion Circle.ā - Curse of the Worgen issue 3
All and all, Iād have to agree with our foxy friend here. Worgen druids specifically are former Harvest Witches whose powers have been amplified by the curse and who have been taken in by the Cenarion Circle to be taught as druids. This means that if a worgen harvest witch is taken in by the Circle, they would be learning that style of druidism, āCenarion druidismā as I prefer to call it, from the kaldorei. This means they are learning the common core material from their own personal kaldorei senpai shanādo. Including earning Ashamaneās gift, cat form.
Forms and control
As for gaining control, using a druid form does the opposite. As you may recall from the comic, worgen are the result of two deities, Goldrinn and Elune. Goldrinnās raw power is so full of instinct and rage that it is difficult to control, and druids are prone to getting lost to it. It is Eluneās power in the worgen curse that makes them appear only half wolf, and gives them the control needed to speak and function. So thatās Elune helping with control, not the wild god.
Similarly, we have cases where druids have lost themselves to their druid forms entirely, such as the Druids of the Claw in Warcraft III, or the various druids in the Verdant Wilds island expedition, some of which are cats. And third, we have the Ashamane lore in the Feral Druid Artifact Questline, which shows how difficult it can be to control all the instincts of cat form, especially one drawing straight from Ashamane.
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https://wow.gamepedia.com/Barrow_Deeps
https://wow.gamepedia.com/The_Fangs_of_Ashamane
https://wow.gamepedia.com/Verdant_Wilds
Why not just worgen form?
Related to this subject, I would love to see a glyph option that allows you to use worgen or wolf form, and I support those threads on the forums. That said, it does make sense why worgen members of the Cenarion Circle would use cat form. For one, it is a fighting style - like a martial arts - that the night elves have perfected over ten thousand years, meanwhile worgen are very new to them and difficult to control. In fact, there is a great quote in Wolfheart that shows how hesitant kaldorei are around worgen, which makes a great deal of sense considering their bloody history with eachother during the War of the Satyr.
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As Eadrik obeyed, Malfurion saw how the presence of this one human distracted the night elves in the vicinity almost as much as their concern over their aging didā¦ despite the fact that humans and other members of the Alliance had had access to Darnassus since its founding. It was clear that Eadrik was recognized as one of Gennās aides and, thus, also recognized for what else he was. - Wolfheart, ch 6
The kaldorei were the first to become worgen, and the night elves bitten by these original worgen turned into worgen themselves in a matter of moments. To the night elves, the origin of the worgen was not only a betrayal and uprising of rebel druids, but also a pandemic. And now, to have a whole host of worgen living among themā¦ cannot be easy. In that way, teaching a worgen druid to fight in cat form may be safer for the night elf, or at least puts their mind at ease more than fighting alongside a werewolf.
So yes! When it comes to roleplay, between common core teachings, testing your level of control, or keeping your night elf allies at ease, a worgen character can still have plenty of reason to use cat form. That is, if you want to. Not all druids use all forms, and it is quite common for druids to have a preferred form and favorite god. Plus, there are some differences between a catās grace and a wolfās swiftness that can make both Cat form and worgen form worthwhile to a druid. If I said the cat form has no use, Iād be lion. 
