I’ve grown up with a PS1 and a handful of pc games, and I don’t remember any of them being any more bugged than modern gaming. The only exception being Digimon World 1, a notoriously buggy game (but to be fair, half of those bugs were introduced by the inept translation’s team).
I know people nowadays know and use a bunch of glitches for speedruns and challenge runs (out-of-bounds glitches being the norm for such runs), but rarely, if ever, those glitches could be accessed by playing through the game normally, to the point that I don’t remember finding any game breaking bug in any of the games I played in my infancy (barring the aforementioned Digimon World).