What’s the heat stress difference between idle/off and heavy-usage/idle for a PC? If the latter is much bigger, then turning it off may have a negligible impact while still saving some energy. Avoiding heavy-usage may also be a better solution than avoiding turning it off.
It’s more easily expressed when people don’t have to directly face the sensitivity of the other humans. For example, from inside a car, in an online competitive game or an online forum.