I was thinking about why trash champs feel good, and I think I figured it out

It's probably because the build isn't standardized, so I get to choose my own item build path

Volibear too — once Mandang standardized a good build for him, it got boring, so I haven't been playing him much lately..

For Tier 1-2 champs, the build is already firmly established, so I don't really feel like building anything else