Most teams don't have two all-star caliber players that are under the age of 24, effectively or really locked up for 4 years. The idea is to identify guys that are between the ages of 22 and 30 that can survive/improve during the 3-4 years of growth of your star potential players development.
Seth Curry fits in that.
Danny Green fits in that.
Demarcus Cousins, if he can keep his mouth shut, fits in that.
You buy a 32 year old today, by the time Luka is entering his prime he's 35+ and ready to retire. The Mavs don't want a top of the line player that requires the ball in his hands to be impactful, it's why Brogdon was a better option than Kemba.
Build the foundation, walls and windows right now with quality depth and then put the Ferrari in the driveway when this team is already playoff caliber. A 27 year old you sign today will be a "vet" by the last year of his contract and our best players will still be 27 years old or younger.
Dirk is gone. The years of trying to win NOW are over, we have time to build slow and the right way. This team was never going to jump to legitimate contender status in one off-season.
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