I compost (and save stuff for broth) and we have a sink disposal. It’s for the little bits of cooked food left on plates, are you composting those? The sink that has one is the least cloggy kitchen sink I’ve ever had, and as far as I understand they are pretty neutral in terms of waste stream.
Grease I agree shouldn’t go in there, that goes in the trash.
This depends. Qi-Gon Jinn saying “concentrate on the moment, feel don’t think” oh my, and he does seem very dedicated and not so political.
But R2D2 gets it done. He is a great character every time he appears.