It's because Luka's skills make it hard to buildHow so? That's on the Mavericks Org and Cuban as they were penny penny pinching with Brunson and the KP trade at the time didn't work out. Not to mention how ass they've been for the most part at drafting and player development during his time there.
The fact that they were able to get Kyrie for as cheap of assets as he did and are now in the Finals is luck in and of itself.
It gets harder building a roster when your star player isn't on a rookie contract anymore.
Luka needs bums like Lively and Gafford to catch his lobs because Luka can't play with a real skilled big man that'll demand the ball in the post
This dude literally had Porzingis but they didn't work out together.
Dallas can't even run a real offensive system because they need to play Luka-ball