We did this during the DWill era. We get 2 All Stars on the team at the same time, plus other decent players, and we repeatedly win 50+ games to get the 4th or 5th seed in the West. It is very difficult to take that next step to become a 60-win team. To do it, we literally need another All Star-caliber player. The Jazz took a swing at it this year with Mike Conley, but it hasn't panned out.
Obviously it's just as difficult for other teams as well -- Blazers, Nuggets, Grizzlies, Celtics, Raptors, etc. -- they all get to 50 - 55 wins and win a round or two in the POs, but fall short of the Finals. Raptors broke through when they finally fleeced the Spurs for Kawhi and two of the Warriors' main players went down with injuries.
The Jazz are one player away from winning 55 - 60 games and really competing for the Finals. Rudy, Donovan, Bojan and Jordan Clarkson are nice pieces. Conley could still step up too.