And the 80s Jazz were better. Watched some of their games. That same Jazz team plays in the 90s, they would have done better.
The big context I don't think anyone has mentioned so far is that the Expansion Era changed everything. NBA added two teams for the 88/89 season, two teams for the 89/90 season, and two teams for the 95/96 season. Six new squads in just 7 years so talent gets diluted, three different expansion drafts and your own picks being knocked down by 6 spots. Because of that it took less to succeed in 1996 than it had in 1988.
Add in the end of the Lakers dynasty, the end of the Celtics dynasty, the end of the Pistons "dynasty", Duncan not getting drafted until the '98 season and Phil Jackson not joining the Lakers until the '00 season, and there was a real void. The old Jazz were one of the teams that filled that void. They were top-heavy so the expansion didn't impact them as much, they retained their main talent past when all the other squads did, and so they were able to slip to the top.
But no one gonna convince me that a team whose #2/#3 options were a 35yo Hornacek and 36yo Stockton averaging just 11ppg each was some great squad. Their #4 option was Bryon Russell, their #5 option was Shandon Anderson, their #6 option was Howard Eisley. Greg Foster started 16 playoff games and Adam Keefe started 10 playoff games even though both were complete non-factors on offense and not particularly good at defense either. Greg Ostertag's 17 mpg were #7 on the team yet he only averaged 3ppg and 4rpg.
This is a Jazz squad that got ROLLED 4-1 in 1999 by a Blazers' team whose top two scorers were Isaiah Rider and Brian Grant (Duncan's Spurs swept those Blazers in the next round with Portland only averaging 76ppg). They weren't that good. They were just lucky to catch a void.