Developers have always complained about being micromanaged or being given business objectives that don't make sense or about changing requirements or some such. But non-technical managers at the same time typically complain that their developers are prima donnas and that their team produces unpredictable and non-repeatable results.

If you understand KPI's, you understand scrum. Scrum exposes the development process to managers and in theory is supposed to give them a better idea of what the team is doing, what they're having problems with, and what the consequences of their management directives are. If that leads to better management of the team, scrum is a success.

Done poorly it may create a wealth of problems. The cadence may create undue sense of urgency that may lead to unhealthy levels of stress or to depression and desensitization of missing work targets. Nonsense competition may arise due to points and velocities.