I leave most of the gear on or in active standby. The amps and power to the Martin Logan outlets (I wired the room to have a central feed to all outlets for the ML’s so I can provide balanced power), these are cycled before I start a session in the HT and after I’m done.
The automation system cycles a series of relays to stager turn-on and shut-down of the rig. It has to, as there are five amps (and 13 channels) in the rig.
Keeping power off to the speakers ensures they do not collect dust (My Monoliths pre-date the ‘music signal sense’ electronics).
Sonically, this works just fine, I don’t hear or measure any change just after turn-on or hours later.