I tried to give you the benefit of the doubt, but based on this, you just don't know what it is you're talking about.
First off, I think you're confusing "compositing" - a process of superimposing images on top of each other, with "composing", as in "creating a story".
Second off, you wouldn't sync audio in Premiere and then toss things to AE for trimming. You would trim in Premiere. You'd use AE for animations, advanced compositing, FX, what have you. This is what's typically done in a "professional" video environment. You can feel free to lecture about your own personal style, but that's what it is - your personal style.
Thirdly, just stop.