I read what he wrote, you told him to unplug everything which is what I assume you do as you didn't mention any switchable hubs. Regardless, I just feel the likelihood of a device dying from being plugged in is extremely low. I think ruining a device from unplugging it is also extremely low but maybe more probable than your case.

Prove to me that there's less wear on a device by having it unplugged when not in use compared to the amount of times you pull on the cable to unplug it. Both have to be so minimal.