The Utah Jazz bench was an obvious issue. After having one of the deepest teams in the league for a few years, the front office decided to invest in more top-end talent. That came at the expense of the luxurious bench depth they were enjoying. That was working ok until Mike Conley got hurt. That meant 1 less high quality player available for Quin Snyder in every game.
Eventually that caught up to the Jazz, to the tune of some ugly losses and arguably uglier wins. I can’t tell you how many times I would check the box score after a game and sure enough the starters were all +20 or more and the bench was all -10 or more.