I don't think it is a style of play thing with Luka. I think it is a total lack of anyone else to initiate offense. He didn't play like this in Spain, doesn't with Slovenia, and wasn't as bad when he was on court with Brunson. Rumors of Dallas looking at Quickley, which makes sense, and they need to get over themselves and start getting Hardy (who looks fantastic in G League and in his one bout of playing time in garbage time) some real minutes and accept some things.
They need to sacrifice some games they're losing anyways to revamp the offense so Luka isn't at close to 40% usage and constantly on ball. Accept some stupid mistakes in exchange for being able to push pace and move the ball and develop Green and Hardy as initiators. Let Wood do some more creative offensive stuff, and Dinwiddie can be a more catch and shoot threat instead of the only guy allowed to dribble when Luka sits.
Doncic needs to cut about 20 pounds and commit to defense.
The common argument is that he's carrying the offense, so his defense will naturally lapse. Part of that problem is he gets a lot of hard contact that doesn't get called, much like Steph Curry. The league is patently racist against Euros and guys like Curry. It's not even a secret. Some people get battered on a regular basis. Trae Young is one of them, because he committed the sin of doing well in the playoffs and bouncing some of the "favored sons" of the NBA.
Dallas is not a free agent destination. They don't have any good trade assets. They need to win in the mid round of the draft on a consistent basis. Rumors were that they were going to pick Saddiq Bey ( the obvious choice for them ) and then the card counter that Cuban hired decided to draft Josh Green instead.
Having Doncic on the roster means they'll always pick in the middle of the first round. So they have to just really mine that part of the draft and do excellent there.
Until then, they've got to commit to being a defensive oriented team, although they don't have that kind of personnel.
The other problem is the Mavericks need a traditional "enforcer" type to protect Doncic, but the league has all but informally outlawed those kind of players. When Doncic gets hit, they need to send Bertans out to kneecap someone for it.
Jonas Valanciunas, as bizarre as it sounds, would be a good fit with Doncic.
The Warriors figured it out quickly, but they had the advantage of getting ring chasers cheap. The total damage to Curry took a dive when Zaza Pachulia and David West showed up. Add them to Igoudala and Draymond Green and there was just way more physicality in place to protect Curry.
In effect, the Mavericks need to start a huge street brawl on the court. Let people know if they want to keep hitting Doncic, that someone is going to get hurt. I would literally sign Enes Kanter to a contract, just to start a fight. I'm almost sure that's part of why they got Christian Wood ( he's not tough, but he's insane)
That's where the modern NBA game, part of it, has failed. They removed the element of basic fighting. Sometimes these guys just need to punch each other and get it all out of their system.