I think half of what you said is correct. Blender supports Goz for zbrush, alembic files, renderman and Arnold for blender , has a bunch of retypo addons that I like better than maya.
The reason I see it not in studios is lack of service if something breaks in blender you can’t call them up and get it fixed.
The bad UX with blenders standard keys slow down creation to a crawl compared to max, Maya or c4d.
That is, of course, you can do what a lot of artists do and insert the Maya hotkeys add on which give you all the Maya keys to work with only a few blender ones to learn.