Well, of course you didn't hear much in the Attitude Era. Aside from the advancement in mics and camera, how much spot-calling do you have to do when structure of matches wasn't as spot-heavy and formulaic. More matches seemed like brawls and felt more improvised back then, probably because they were, and when you look back, there were hella botches but we weren't as nit-picky about it.
What would Rock and Austin REALLY need to discuss outside of reversals of Irish whips and when Rock was going to block and start striking Austin toward the other side of the ring? When you're wrestling Austin, you don't have to hear him say it to know that he's going to Thesz Press you for the comeback and it's not like you have much choice when a guy that big jumps straight up onto you.
The other thing might be that the crowd used to be a bit rowdier and actively loud throughout the course of a match. Now, it seems the crowds are a bit more reserved until the go-home spots and sits on its hands throughout unless they feel compelled to chant together for pockets of the match.
Commentary may have something to do with it as well, but who knows.