I think Exum's injury hurts them a lot more than we thought. For all his defaults, he was a great defender and he brought a lot of size, plus some 3 point shooting. Now every PG can run to the Jazz hoop freely. Gobert / Favors can't block everything, they just don't get enough help here.
Neto / Burke is a terrible defensive squad at PG.
There are just too many holes in the team right now, starting with a good PG and a reliable backup big (Withey would probably be their best bet right now).
I don't understand why they didn't make any trade or recruit any FA after Exum's injury. It hurts the team a lot.
The offense is still bad (Gobert didn't improve, outside of Favors and maybe Burks nobody did actually), but the defense has regressed quite a bit.
The final 19-10 from last year looks over now, the defense is simply not here anymore. It could come back next year with Exum and some reinforcements.