I'm tired of AE, just like Mike (The animator who creates all the polished animations on my page)
So, for the last couple of days, I've been working on a script that auto-generates a mesh from a transparent PNG. I've succeeded!
AE pre-rendering sometimes takes 30 minutes just to see the entire animation when you move just one bone/mesh/object. This is so stupid.... Why are the untouched parts re-rendered too? I feel sorry for all the motion designers who've ever had to deal with AE...
Perhaps I'll eventually create a course on 2D animation in Blender, because the other programs I've considered lack one or two essential features, while Blender has almost everything I need

Spine2D - lacks convenient clipping layers (you have to MANUALLY create a mask from polygons)
Live2D - lacks incredibly important IK bones, constraints, and drivers
After Effects - incredibly slow and unoptimized, even with plenty of memory on your computer.

To sum it up... Animations will be faster, better quality, and... that's all. I can finally be happy, because even though I'm not an animator and very rarely animate in AE, this problem really bothered me