Not for dinner conversation
Well, the purpose of the handheld shower massage is - and I hope this isn't TMI - it's the only way, outside of a long bath, to get really clean down there, IMHO. TP just kind of, well, smears it around. For years I was quite squeamish about such things until I figured what the heck it's just another part of my body that needs upkeep like any other part.
A bidet would be a tad more convenient - esp when one must dump and go fully dressed - but it would be a major plumbing expense to have one installed in one's home, at least in the USA.