I used to have an Adcom GFA-555 that I left on all the time.
When I got back into audio gear during COVID and purchased some Aragon gear, it very clearly stated in the owners manual to turn the amps off when not in use.
After being between those two extremes, I'd probably think letting the equipment warm up a bit isn't bad, but I see no need to leave SS equipment on all the time nowadays.
To each their own.
Amp — Leave on or turn off
I always turned my Benchmark AHB2 amp off after use every night. After all, why is there an on off switch on the front panel if not to do that? Last night I accidentally left it on. This morning, when I played my first record, I couldn’t believe my ears. The same record I played last night sounded infinitely better. I tried a second record and that, too, was much better.
I know there’s a debate on the question of leaving an amp on all the time.
I now know where I stand!