For many years I used to tell my customers to leave their equipment on all the time, and just accept that dial lamps would go out more often.
Alas, the last few years our society has become more litigious, and insurance companies more aggressive in disallowing claims.
I believe that leaving your audio system on while you're away from the home makes it impossible for you to put out a fire if one starts in your system. Similarly, if you smell smoking resistors in a power amp or power supply, you can't shut the system down before the problem spreads. For this reason, a claims investigator could reasonably claim that you had created a climate of neglect and in so doing had failed the test of due diligence in mitigating risks.
Compare this to operating certain indoor heaters without a carbon monoxide detector, leaving a skill saw plugged into a long orange power cord in an area where children have access to the saw, etc.
So . . . now I tell my clients to turn their equipment off when they're not at home.
Fred