I always turned them off, unless I was just going to eat dinner and couldn’t save. The lasers for old systems like the PS2 and Sega Saturn have a longevity, and will wear out over time. I’d rather not speed that up since I plan on keeping them around. I was also scolded for wasting electricity growing up, so that is burned into my habits as well.
This could probably be used to check for authentic game cartridges. I’m not going to be licking used games to find out if they’re real, though.