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.
Indeed a quick improvement of the application. And that would really be something, if adobe actually listened to the users that already pay the subscription. I do not hope that Adobe will fulfill this improvement like they do in illustrator. To edit curves other than like 30 years ago you have pay for a plugin...
Adobe, why is adding such a simple function and at the same time significantly improving the animation process such a difficult challenge for you? Neither precomposition nor shy layers are the solution when it comes to sorting out a mess with multiple layers. To avoid chaos and a headache, the timeline must allow you to group selected layers and open only the selected ones with one click, without going into a separate composition.