I would love to train my cats to use the toilet. Both my kitties are over 10 years old, though, so that’ll have to wait until my next round of kittens. It’d also help if I had a second bathroom for them to use, at least while the training was happening.
I don’t think it’s unsanitary or gross at all. No more than sharing a toilet with another person, anyway. Unless you live alone and never have visitors, or unless you sanitize the seat before every bathroom visit, you’re always risking touching other people’s pee or poop, or at the very least, touching places where their germs have travelled to.
I don’t know about anyone else, but I’d rather clean up my cats’ poop than people poop.