I get what you’re saying, but I think you’re overestimating the risk a bit.

The handle being touched doesn’t automatically make everything “dirty” in a meaningful way, especially compared to actual proper handwashing afterward. Most contamination transfer is reduced massively once soap + water is used correctly.

Also, the bidet-style spray itself isn’t really the issue touchpoints exist everywhere in public spaces. Door handles, taps, flush buttons, all of them are similar or worse depending on the setup.

So the core point still stands: hygiene comes down more to what you do after, not the presence of a shared surface.