this
i view the 90s bulls similar to the 80s 49ers
for years, NFL teams were built to run the ball, and stop the run, along with the occasional deep pass. when the west coast offense that the 49ers ran came into play, teams simply didn't have the right defensive personnel to match up with them, and they completely dominated a decade. but nowadays, almost no one bothers running the west coast offense, because defenses have figured it out and are built to prevent it.
likewise, the NBA was built around point guards who controlled the game to get the ball down low to big men and low post scorers. the bulls were a very different animal, generally being smaller than most teams, more focused on wing players, precise off-ball movement, and 2-way versatility. teams generally werent built to match up with them. the ones that actually could, gave them problems, despite being noticeably less talented teams (knicks, pacers).
nowadays, the entire NBA is pretty much built on wing players. the league is built to match up with teams built the way the bulls were.
thats not to say that those bulls teams wouldnt have success in todays league, they absolutely would. however, lets plug them in for an 8 year stretch during some of lebrons best years from 2009-2017, and take lebrons teams out of the equation. due to matchups, i have a hard time believing the bulls win 6 in 8 years, while having to combat the dynasty spurs, dynasty warriors, along with near-dynasty celtics and lakers (if not for injuries, a case could be made that either team should have 3-peated from 08-10). and thats with the bulls being completely healthy, lets not even factor in the injuries miami dealt with in 2014, or cleveland had in 2015, or the departure of kyrie in 2017.
at the thought of mike beating KD or Steph warriors without pippen, or a dynasty spurs team (with a brilliant gameplanning coach in pop) with pippen on one leg