Danny rebuilt the team into the 2008 Title team, which went through 2013.
He then rebuilt the team again with Irving, Hayward, Horford, and the young players; but that rebuild ended in 2019 with the departure of Irving and Horford. He probably deserves some second guessing for a few of his decisions/non-decisions during this time (ie, not going all-in), but he deserves just as much praise for his drafting of Tatum and Brown. Besides, injuries and weird CBA rules (not being able to trade for a 2nd Rookie Extension contract in AD, not being able to extend Irving to a true max contract in 2018 when he actually wanted to be here) derailed much of what could have been.
So, here we are in rebuild #3. We surprisingly made the ECF last season, but the same could hardly be expected this year with the rise of the Nets and Sixers, as well as the Bucks continued strong play. We lost Hayward, but gained a potentially valuable piece in the TPE. Honestly, I think we have to give it a couple of more years before we consider moving on. Danny has done a masterful job rebuilding two completely different Cs teams in the past and we have the building blocks to get there again...But I agree, there probably does need to be a pretty major roster overhaul for us to be one of the elite contenders. This team's ceiling just seems too low - even with Tatum/Brown.