The leveling experience is so fast and easy that it doesn’t really teach new players anything anyway. I bought my girlfriend an account in BFA and she leveled a hunter to 120 by just using the first 2 abilities it gave her. I asked her why she wasn’t using anything else when I was watching her play one time and her response was “why? the stuff is dying and I’m not”. She was playing BM and didn’t even have KC on her bars. She had even joined a few dungeons while leveling and surprisingly never got kicked out for low damage because apparently putting a dot on everything and cobra shotting was enough dps. At first I thought sure, she’s playing a bm hunter, the pets doing all the work but there are a lot of specs where you can just throw talents anywhere and use 1-2 abilities and be just fine throughout the entire leveling process if you’re just killing one thing at a time. I’ve leveled quite a few characters this expansion and it’s just a real dumbed down process and I actually really enjoy leveling characters (sitting at almost a full account of level 50+ toons).
As for the topic in general, I don’t see the problem. I haven’t used a boost even from the preorder yet, but of all my friends who have the gear is garbage but you can instantly get into zm and upgrade it with flux regardless of what kind of content you like to do. You can instantly get renown 60 and all conduits at ilvl 200 which is more than enough to get you started. I don’t see the problem.