It is a good thing to set goals for yourself. Whether or not you achieve those goals is not as important as the act of setting them, because we should never be completely satisfied with where we are. The Dallas Mavericks (and all NBA teams) should be the same way.
When it comes to changes that need to be made to make an entire program better, they’re usually not too hard to find. Even the immaculate Golden State Warriors know they have things they should really improve on, and have throughout their entire run.
The Mavs are currently sitting at 18-20 as we approach the halfway mark of the season.