in my observation,
most equipment that are frequently powered up and down do not seem to have the longevity of equipment that are started infrequently but run longer operation cycles.
the blue screen of death can strike any digital equipment without so much as a warning, a lot of those failures are on startup .
older welder technology, for being less efficient, is highly reliable in most cases.
i'd bet a paycheck on my old tombstone firing up in 2 months
i'd bet a paycheck my miller idealarc-250 will run in a year
i'd bet you another paycheck that my Powcon will fire up tomorrow, but i don't know about next year. only because i used the crap out if it and it's had a hard life.
i don't know if i'd do the same bets with the newer unseasoned technology puked out of China and purchased from amazon or the like.