Timeline folders. We have them in Animate, Photoshop, Illustrator... precomps can utterly ruin your work and is NOT an alternatives to having a simple folder hierarchy - especially when dealing with shape layers or anything that requires continual rasterization.
It would be great if you could make group layers work - For example I want to use a group of layers as a displacement map in my video, but I'd rather not use precompose and have to enter the precompose group and switch back and forth to edit stuff. The new master settings based on essential graphics is a good step, but it would be great if groups like dropdown folders could be added, and be made visible as a layer that can be used for displacement maps, alpha mattes and more off the bat. Also, precomposing breaks parent links if you have stuff parented and synced inside and outside a precomp, if groups worked instead that'll be much cleaner and faster.