Being a middle manager (and therefore biased), I view my role as the person who serves the team by:
- being a firewall from upper management
- giving the team the things they need to do their jobs
- removing the things in their way
This allows them to do their jobs as best they can. Could they get by without me? Probably. But they would have a worse time and not be able to work as effectively.
Those round up things are a scam. The business collecting the money takes a huge tax break, even if they do pass it on to the charity. Just donate to the charity and take the tax break for yourself.