Firstly you are dead wrong in your assumption, and literally a lot of the top keys completed if you followed it used Moonkin Form. Raid even takes a caster oriented profile too to a degree but you definitely wouldn’t have as much time like in M+.
So if the best Resto Druid parses used it and now are bad I don’t know what to say . It was an insanely safer, most mechanics/mistakes where one shots, so a lot opted to be ranged. (Not saying all).
So yes I agree the average keys did use Cat Form, you had insanely more down time, and way more time to use Kittyweave to have a better dps output, but the higher the key, less time was available, the dps you’d use where caster spells.
Moonkin Form was important to Resto, not just though as a means of damage in high keys, it did so much more.
Utility, Armour, Polymorph Protection in PvP all while still be ranged, to actually a lot of players it was also enjoyment given. It needs to comeback.
Currently Resto now is so dull, it’s lost a core part of it to a lot of players who preferred it too, their was no reasoning to remove it. It’s literally part of being a Druid, Shapeshifting is what our class is about.
Although I agree with this, I find it insanely odd they removed this from Resto completely and made it Feral only, Adaptive Swarm was great for Resto and to me was our old Insect Swarm on steroids.
But in short Moonkin Form for Resto at minimum needs to return and I’ll continue to fight and argue for its return.
R.I.P Owlweaving, Gone but not forgotten