That type of thinking has been shot down in here and everywhere else time and time again. If you want to be a championship caliber team, you probably need two great ball handling offensive creators. First of all there are multiple examples on how well that type of personel has worked: Lebron&Kyrie, Steph&KD, Harden&Paul ect.
First of all DSJ with his lack of basketball iq, constant nagging injuries and questonable additude is half the player that Fox is. When it comes to DSJ, the issue is more that Carlisle doesnt like him that much (low basketball iq ect.) and apparently he has some additude/off the court problems. Having Doncic didnt create those problems, or if Doncic becoming the alpha dog was part of the problem for DSJ, he was never going to be a winner either way unless he was ready to be more of a team player.
Doncic isnt perfect and isnt a seamless fit to every team. As I wrote about him pre draft, a team that drafts him would benefit a lot from having a sizeable well defending sf/pf that could guard the best opposing wing. Hes most effective with the ball on his hands BUT since he is a good shooter, he can play off the ball and there are numerous ways on how a team can utilize having two good creators on the floor at the same time. For example, Cavs used to murder opponents in the 4th quarter by simply running Kyrie-Lebron pick n roll. You switch, you're in trouble. You go under, you're in trouble. You go over, you're in trouble. And thats just a one example, there are unlimited ways to utilize two ball handling studs on your offense. When it comes to guys like Buddy and Bogdan, raw numbers would go down but efficiency would go up. With good coaching if you have a dominant creator handling the ball while you have your other creator with Buddy Hield setting screens to each other and cutting ect, your offense would only get better.
Another good example on why its beneficial to have two great ball handling creators, is staggering them so that one is on the court at all times. In general, a good ball handling creator is the most valuable and most difference making of player you can have. Assuming you play your creator 35min a game, you are left with 13minutes without him. Having another guy like that playing those minutes (and vice versa) allows you to have an extremely productive player creating your offense for the whole 48minutes.