Why do they tell you to be at the doctor's 15 minutes early, when they always are at least 30 to 45 minutes behind everytime?

It's usually 4 to 6 different people causing this,
Only 1 is the Doctor!

Scheduler, (Booking everyone too close}
Front Desk when you Sign In (Marking You There)
IT Dept. (The Software Informing the Staff You're There)
Doctor's Nurse or LPN (Noticing You're Waiting)
Doctor (Older Doctors can't be hurried along)

A Team that Cares and Understands the Importance of Your Time as well as their's and is Communicative will Run on Time.
My Cardiologist's Group Practice could win Awards for Prompt Friendly Thorough Appointments!
Only 5 Minutes after Check-in usually and I don't care about waiting in a room 5 to 10 Minutes, because I know he is Giving someone a Quality Visit, like I'll get if Needed.

So you wouldn't have high bp like me when I rush up the stairs to my endocrinologist. 😅

Bureaucracy is why, they just have to make it as hard as possible, waste as much paperwork as possible and waste your time as much as possible and have as many acronyms so much to the point it's an acronym hell... as possible. It wouldn't be bureaucratic otherwise.

Class status. Lives come after elite earning pros.
STEM means "gold diggers only " in schools, now.

Yeah good question. One I'd like to learn the answer to. *goes undercover*