Hyperbolic, made up scenario, but yeah pretty much. You get the time slot you scheduled and you should be held responsible for using it. Most offices ask you to check in at least a half hour early for a reason.

I could just as easily switch that around and ask if you believe some poor guy who finally got an extended lunch break from his minimum wage warehouse job should be fired because he had to wait an hour at the doctor's office because some rich white lady spent 30 minutes past her appointment arguing about essential oils. Painting is pretty easy when it's all black and white.