Overhaul of Illustrator's 3D capabilities.
Illustrator's 3D effects are hugely outdated. Something that matches or even exceeds After Effects would be a would boost to the program.
Heck, even something that allows you to easily rotate and move the shapes around in 3D space like AE would be great. Illustrator's current 3D tool are clumsy and cumbersome.
Illustrator introduced a new panel for creating 3D shapes in October 2021 — '3D and Materials'. Older effects are still available as 'Classic 3D'.
If you want to give feedback about this feature, you can do it here: https://illustrator.uservoice.com/forums/938463/suggestions/44254299
or log in a separate report/request