re: Why do new managers always come in and want to change everything?

Depends why the new manager is there. If the old manager got promoted, the new one should spend at least three months doing mostly status quo before making any sweeping changes.

I'm middle management, and I generally try to not rock the boat with new stuff all at once, but I'll walk that fine line between keeping employees happy but getting the work product in a way I can best review it. I have had some less experienced employees lately, so it's been a struggle to get out of the weeds without setting stricter processes.