People are paying money, they don't want that extra hassle because otherwise, they'd just eat at home.
The cafeteria at my work is like this. I don't mind at all, however, I only go when the meals are free so that's definitely a factor. If I was paying, I wouldn't bother going.
I usually only see those in hotels. Every place I've lived in allowed the adjustment of pressure and temperature. If you live in a place that doesn't, you can also buy shower heads that can adjust the pressure btw.