I have always understood FP had a batch of bad breakers that spoiled the reputation of everything made before and after.
Nobody is really sure how many bad breakers there were and the actual evidence of the problem is anecdotal at best, always "I know a guy who knew a guy" stuff.
I would get rid of an FP panel because it was old, if I was doing work in there anyway but I would not sit up nights worrying about it.
All that said, a home inspector will crucify you for anything FP, whether it is Stab Loc or not ... because they are usually working from a script they do not understand.
Do we want to talk about Ideal 65s next
