Not using electric motors? I was never impressed with the led blinky effect.
I'm confused, there is no load on on the Big E spinners. Motors today are cheap and really reliable. Ventilation isn't much of an issue either.
I'll bet they are more concerned about something coming loose, and running for weeks without anybody noticing.
I think it's all about not having vibrations, even micro vibrations over man years could start causing things to come apart.