I have a 30 or so year old 2401A pack. I use if for shoots sporadically; it is not sumething one takes to a shoot lightly. It still does exactly wah it was designed to do.
I treat it like a cat - with a cat you can leave it pretty much alone as long as you change the litter box once in a while.
I power my pack up for 20 minutes at least once a month. With this treatment I have never had a problem with it.
The speedo putting assistants in the hospital likely came from plugging or unplugging a head cable while the pack is charged up.
Another analogy is in play here - how fast does a car have to be moving for you to think it is safe to open the door and step out and not expect to be hurt?