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For now yes. But if a 12V power supply breaks (router, switches, ...) this would do the trick until a new one arrives.
Also I have some led light strips that run on 9V and had to buy an specific adapter for those.
I could also power the BitAxe (5V ~20W) or the NerdQAxe++ (12V, ~80W) with it.
Happy to leave it laying around until it's needed urgently :-)