I have similar issue with Q60T TV.
Initially I expected the TV to have it’s own On timers (like some older models do) and was about to return it to the store (but I otherwise really like the TV).
Happily I found that the TV will turn on, at the same input/channel, if it was ON when power is cut and restored.
So my workaround is to keep the TV on and use a smart plug to power up and power down as needed
I can do this through the smart plug’s own app, or through Google Home.
Also happy to find that the scheduled channel changes continued to work after powering on again.
Knowing that powering on/off is probably not the best for the TV, I tried to setup the automation directly through Smart things and Google Home
I was really surprised/disappointed to find that the TV goes off-line and does not turn on after being turned off (as reported by many on this thread).
TV is off-line when powered off and none of the expected automations turn it on.
I stumbled on another workaround when I noticed that switching the input to Roku would wake the TV, even if when it was off.
So I can now set a Google Home routine to turn on Roku (even if Roku is already on) and then run a scene to switch the TV source
Samsung - it shouldn’t be this hard.