The reason for this is that bidets have had a massive upswing in popularity, and unfortunately many are poor quality and/or fit, installed incorrectly, or both. My family mostly works in the trades and I did as well in college, would not call myself a pro but I'm the friend you call when you have a plumbing problem and want an opinion before calling in a real plumber.

The number of poorly fitting bidet attachment seats that have been badly installed I've seen is quite high. If I owned the bathroom and someone wanted to add a bidet, I too would have my concerns. A ban is crazy, but I think it's totally valid to at least have a plumber inspect and sign off on the work.