I agree strongly. I dislike 'tip inflation.' Sadly, part of it comes from consumers. I've noticed in online discussions (not just ScubaBoard) some people take pride in being 'good' tippers and aren't above using tipping as an opportunity to virtue signal. So the well-meaning but insecure person sees that someone on the Internet reports always tipping at least 20%, and thinks 15% is stingy.
At some point, the added cost and awkwardness discourages taking the trip. I don't like discussing tipping on my trips, but in recent trip reports I've included rough general tipping as a budget discussion item (mainly what I think a lot of mainstream divers are doing) because I it's important to estimating what a prospective dive trip will cost.