Yes, power cycling most often treats the symptom, not the problem. As a consumer, you often don't have a way to treat the problem, so that's your only recourse. As an engineer, or really anyone capable and responsible for fixing the problem, often you do not want to power cycle, because if the problem goes away you may no longer have a way or reproducing it. That makes most problems harder to fix, and possibly impossible to confirm fixed.

I often reduce how I classify the importance of bug reports I get that I can't reproduce. It's often not efficient to work on something with so little information to go on. Further information on the bug or a reproducible error case vastly help.