I'm in the minority on this, but...
I am constantly amazed at how players get better and better, and therefore how insanely and ridiculously close many of the calls need to be.
Take Puka Nacua's sideline catch, for example. I mean, what human on earth could have possibly seen that call ACCURATELY in REAL TIME without the aid of slo-mo AND close-up replay? Puka's right toe was BARELY inbounds by the tiniest hair just a SPLIT-SECOND before the rest of his foot rolled out of bounds. Cripes, his shoelaces were almost out while his toe was in!
My point being... I think many fans have lost perspective on how INSANELY CLOSE so many calls have become.
When I go to a game, from far away, it's easy ti lose perspective on how FAST these guys are. I move closer, and then I see, "wow, they're elite athletes". On the field itself, the speed of play must seem BLAZING fast to us mere mortals.
Refs have to make split-second decisions on split-second plays with super-elite players with the tiniest of margins. And then we sit in our recliners and watch the super-slo-mo replays on our big screens and say "it was obvious."
IMO, referees haven't gotten worse over the years. It's that the pace of the game has led to constant razor-thin calls, and technology exposes the mistakes.