Obviously you're being hyperbolic by saying "there are no ways to improve", but there are a lot of ways to improve a team. The draft isn't the only way to improve. I would feel differently about Don+Gobert if 1) I believe the roster that was just put together was optimal 2) the flawed roster played to their potential and 3) if tanking wasn't a permanently available option. The results are what they are, but by no means do I think it was representative of the potential we had. It's definitely not a "we did everything we could" type of situation.
Change the coach, make better moves on the margin, make a good trade, don't use the MLE on a guy who you have to pay to get rid of a year later. There are a lot of things you can do to get better. Basically, all the the Jazz did horribly were still able to be done better and improved the team. Tanking is permanently available option whereas having Don+Rudy at the same time is a special opportunity. I know, it all seems unlikely. But if/when we tank there's a long way to get back where we were, and there's no guarantee that when we get out of the other side it's going to be better. For as difficult as it is to retool, it is also difficult to find a Don and Rudy at the same time.
Perhaps personal issues made it impossible to continue anyways, but that makes the FO blundering even more devastating. I think the arrogance to sit on their *** for the past two years and not acknowledge any kind of weakness/failure is the biggest organizational failure I can remember as a Jazz fan. It will never sit right with me, and I cannot believe how many justified the inaction.