Do you think it's possible that reports may think this is a waste of their time?
Blaming the employee when the manager is responsible.
My manager blocks off 2 hours per week. If you have something to talk about, put a meeting on his calendar. The only obligation is the semi annual 1:1.
I talk to my manager on a daily basis so any 1:1 is really for career path, no project status, gripes about people, etc.