It works both ways. Good luck guarding Kareem, Worthy, or Magic by today's rules. Or Bird. Or McHale LOL! Or Jordan, Barkley, Hakeem, etc. As I said, it works both ways.
The 80s Lakers & Celtics, depending on which specific year you're talking about, had 5 hall of famers on them with at least 3 in their prime (Kareem's prime being longer than most players' careers). The Warriors aren't doing something new.