@bigtwin
Other than increasing your electric bill, heating your room and shortening the life of your equipment, why would you leave the system powered up 24/7?
Electric bill - insignificant
Heat - insignificant
Shortening the life of equipment - From both a theoretical perspective (I have a EE degree) and a practical perspective (I’ve had components powered on continually for 17+ years) your presumption is a myth. Now there are some caveats - properly designed heat dissipation and proper ventilation. Shove a Class A amp under a mattress and, yes, bad things will happen. But solid state components do need time to stabilize to sound their best, and I don’t have the time or patience to wait.