> I don’t know, I am a recent convert to Mac but OSX is much much more buggy than ios (I guess due to tech dept and backwards comp?)

Agreed, but iOS is playing on easy mode: it sandboxes everything to a high degree, everything running on it went through some amount of checks to make sure they won't mess up the system, it routinely kills processes so apps must be written to resume properly from a cold start, and it (even today) has relatively limited multitasking. It both doesn't let programs do as much, and encourages or forces developers to employ practices that (I suspect) tend to improve program stability.