Doctors who make their patients wait

Where do ~some~ doctors find the audacity to make their patients wait for hours?

I get that everyone’s time is important and that sh*t sometimes happens but is it too much to ask that doctors inform their patients or secretaries in advance if they will be late or not show up at all?

Typing this at 10:55 am while waiting for a doctor to show up for his 10 am appointment. I am in a private facility btw.