I believe it's legal to throw the same "3 hole" angles at any ATA event even today. It's just that most clubs opt not to do it. So, on average, today's angles aren't quite as extreme but now you can't read the traps, so what's the big difference? I think higher scores has more to do with shells, better dissemination of knowledge, and adjustable guns. But even if the targets are easier, it doesn't make much difference in the end. I mean after all, if they're so damn easy then simply don't miss any and nobody can ever beat you.
In short, the subject of 3-Hole targets is just something for old has-beens to whine about.
-Gary