Experiencing frustration
When an average manager hears about a frustration that her staff experiences, she will take note, and perhaps look for a solution.
When a good manager hears about a frustration that her staff experiences, she will prioritize finding a solution.
And when any kind of manager — perhaps through covering a shift or filling-in — suddenly herself experiences the same frustration that her staff lives with ... that’s a problem that will most likely get immediate attention.