The problem is that in most cases there are trade-offs. For years the Jazz (and other teams) have been trying to balance creating a league-leading offense with a league-leading defense. This is very difficult to do because it ultimately means the team has to have elite two-way players. The Jazz used to lead the league in Defensive Rating, but during those years they couldn't score enough to compete with the top-tier teams. So instead they started migrating to a more offensively oriented team. They replaced Rubio with Conley, replaced Crowder with Bogdanovic, replaced Exum with Clarkson, etc.
The Jazz came to the conclusion that they could combine multiple elite shooters and creators on the floor with a best-in-class defensive anchor. It's a hybrid approach. The result is that the Jazz currently have the #1 rated offense (by a mile), and the #6 or #7 rated defense. Not bad at all. The problem is when the other team has a versatile center who can play out on the floor (e.g., Jokic or Adebayo), or the team can play a PF at the 5 and but still be long and athletic enough to defend well (e.g., the Clippers). This means that the Jazz are vulnerable to certain matchups.
However, if enough of the Jazz's offensive players are healthy, the defensive vulnerability shouldn't matter much. A lineup with Conley/Mitchell/Bogdanovic/Clarkson/Ingles, etc. will outscore the other team and make up for whatever defensive weaknesses the other team can exploit. In other words, if the Jazz were healthy they probably could have outscored the Clippers even after the Clippers broke the Jazz's defense. And to be fair, no team is going to make it to the NBA Finals without staying healthy.
The Jazz have several mostly one-dimensional players, including Bogdanovic, Clarkson, O'Neale and Ingles. In order to improve, the Jazz would need to replace one or more of these one-dimensional players with a multi-dimensional player. For example, replace both Bogdanovic and O'Neale with Jaylen Brown or Paul George. However, that's very difficult to do. Rudy Gay might be able to step in as a 2-way player in much the way Nic Batum did for the Clippers. That would help the Jazz tremendously against certain matchups, since Bogdanovic and O'Neale have defensive limitations. The problem is that Gay is showing his age. He's no longer the guy who flies down the lane and dunks over people. He's become more of a Donyel Marshall stretch-4. He has enough size to be a defensive deterrent though, so that helps.
In order for the Jazz to improve from where they are, they would need to make a trade to replace Bogdanovic, O'Neale or Ingles with an effective two-way player--Jerami Grant, Christian Wood, maybe Harrison Barnes, etc. As much as we like Royce O'Neale, he's probably the guy the Jazz need to upgrade in order to take the next step, assuming Rudy Gay doesn't have that impact.