I'll also note that appeals to "did you fall in poo" are farcical and somewhat ignore the fact that most people don't bathe/shower every day. A practice that is surprisingly common in the US. (I gave a quick attempt to see these stats across all nations. Didn't find anything that looked good for comparisons.)
I'm personally not opposed to bidets. I also don't know that I expect to see a lot of benefit, though? Would love to know why our poo habits require so much more work than most animals seem to require.
I can't speak for all animals, but at least for the dogs and cats that have been in my life, I suspect a large part of it is that we can't / don't lick our own butts (and even if we could... I suspect we'd prefer the extra work)
Even our long hair cats typically do not have feces stuck to them.
We also wear clothes.
On the cheaper models, the nozzle is always there, so yeah it'll be another surface that needs to be cleaned.
On the more expensive models, the nozzle is in a separate chamber until it is being utilized, and has a separate mechanism for spraying / cleaning itself. That makes it a lot less of a cleaning burden.