When I was growing up, these seemed to be ubiquitous and I never liked them. They seemed overcomplicated for the purpose, and created a gross and smelly area under the sink that needed more cleaning.
I haven’t had one in years, as a simple sink mesh does the same job. But I don’t really know how other people are. Are under sink garbage disposals still common, and commonly actually used by people here?
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.