If you are stock piling for an inordinate amount of time - 20/30+ years. Boxing electronic devices could backfire on you if they just sit without being periodically used... I guess if you store them in a vacuumed / hermetically sealed container you might be alright, but who is going to take that extra step...
Planning decades out may be a little much, but I can see the argument for it, (depending on one's age).
Anyway, vacuum sealing things in bags isn't very difficult or expensive to do.