There is quite a bit of turnover in the minor leagues and explains why there are a substantial number of jobs available each year.
The vast majority of people who watch baseball can properly call 95% of all plays that happen on the field. My job is to teach you how to call the other 5%.
Managers have very tough jobs. I always respected their job but demanded respect in return.
No one respects the umpire's job more than I do; but, if I were a manager, I would probably be ejected three or four times a season fighting for my team.
As a whole, the managers today are different in temperament. Most have very good communication skills and are more understanding of the umpire's job. That doesn't mean they are better managers. It just means that I perceive today's managers a bit differently.