Most of the top teams tie up their salary in the top three players on the team. If a team gets that mix wrong they are are luxury tax hell.
The key is to be able to keep the team together and when they pass their peak/window, have valuable assets they can trade or have expiring contracts to clear space.
It looks to me the Suns are looking to make a 2-3 year run before they have to change their core players.
I've been saying that for a while, and after these next 2 seasons, get ready for another decade like the 2010s. That model is just not sustainable for several reasons. This isn't baseball, where a team can easily just tear it all down and be a championship contender in a few years. As we just saw, it isn't easy to build a winner in the NBA, especially in a place and with an owner where free agents tend to run in the opposite direction...