On a general note, I think it unwise to assume that the small, self-selected posters on CC are truly representative of the mass cruising market. Basing opinions on the evidence of CC postings leads to false impressions.
We have eaten six times in speciality restaurants on Princess, post covid. We have tipped twice, where we felt the service went above and beyond. On the other occasions, where the wait staff merely took our order and delivered the meal, we left nothing. On a purely non-scientific basis of observing the half dozen tables or so around us on each occasion, the majority of diners simply stood up and left at tge end of the meal, and walked straight out of the restaurant.
All of which goes to show that there is absolutely no way of knowing if the majority tip or not.