I worked with an MBA who couldn't seem to iron his shirts (or just didn't) for a while. Slowly his job duties were shifted to me... the guy he was supposedly help manage after he proved he couldn't figure out scheduling a 24/7 schedule.
He clearly had no experience beyond school and some internships.
Like this guy couldn't manage a taco bell... maybe that should be the barrier to entry, to get into class you have to manage a taco bell for a time....
Funny enough, many years ago I had a very aggressive candidate for a mid-level technical development manager position who was insistent that his newly minted, no computer experience required, MSCE certificate or some such plus his handful of years managing a Pizza Hut qualified him for the job, because "a good manager can manage anything". I disagreed he was right for the job.
Edit: See Wharton class stats, shows a mean work experience of 5 years.
https://mba.wharton.upenn.edu/class-profile/
MIT/Harvard/Stanford show similar:
https://mitsloan.mit.edu/mba/admissions/class-2020-profile
https://www.hbs.edu/mba/admissions/class-profile/Pages/defau...
https://www.gsb.stanford.edu/programs/mba/admission/class-pr...