Yeah, in 2077. And I've seen a lot more hardware dying of doing nothing than of doing something.
Does it still has tubes in it? Because then the thermal expansion could case severe damage still.
To be honest, it is device specific and it has always been like that. There are multiple component concerns and life spans, so leaving device shelved is not bad for those, especially capacitators, that have limited amount of working hours for ripple suppression, the fact they aren't budged and look good does not mean they do anything good anymore. Same applies to semiconductors and possibilities of electron migration and causing holes. Let's leave OLED screens powered on and cause burn in too, actually cycling those things is good.
So leave this saying aside... it is a myth for modern electronics.
Few days ago I powered this one, that was in the rubbish bag for over than ten years... so what's your point?