If the plumber stinks and doesn’t get the repair done right, I file a complaint with either his boss or the Register of Contractors. They check on what he did - since it is visible - and deal with it.
If a waitress screws things up or is just slow as molasses in winter, complaining only makes me stay longer in a bad situation. It does me no good to find out if she is fired 8 weeks later after the complaints build up.
Read the posts, it had nothing to do with not doing the repair “right”, repairs that almost all home owners will never see.
As that post correctly pointed out “” your plumber has a vastly greater range of service that he can deliver to you based on how he feels about you, or what mood he is in, or what type of man he is, yet you trust him to just do his job well, while you don’t trust us that have been in the food service business to do ours, unless we have the hopes of a bonus, of a tip.””