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You can do on/off using an IR blaster (broadlink integration with discrete on/off codes). It’s when you want to read volume etc things get trickier

I have an automation that turns on amplifier only when using certain inputs, not just when the TV is turned on. I can easily imagine people would also configure their amps to use different input depending on TV input.

Put the tv on a zigbee/matter plug and connect that for the power. (Just be mindful that some TVs need to condition their screens and they will do that when turned “off”, typically during the night. So it you do a hard power off you will need to perform it manually. LG calls it OLED Care iirc.)

Yeah CEC is a bit tricky sometimes. How about auto-off from the TV itself and then a timer for a HA controlled outlet to turn off power after that using automation (i.e., when the streaming device is off for a x minutes)