Most teams have their best player bring the ball up most of the time.
Its not stroking ego - its keeping the ball in the best player's hands
Should Dallas take the ball out of Luka's hands?
Lakers / LeBron?
Suns / Durant?
TWolves / Edwards?
Nuggets/ Jokic?
There's lots of examples.  I think your opinion of Dame is creating a massive bias here
		
		
	 
Dame - 35% three point shooter
Luka - 38% three point shooter
LeBron - 41% three point shooter
Durant - 41% three point shooter
Edwards - 36% three point shooter
Jokic - 36% three point shooter
Giannis - 27% three point shooter
It's dumb to have him bring the ball up the floor because 
A) He's not the distributor that Dame is. Not even close.
B) He isn't a threat to shoot the ball beyond the arc. 
All of the players, except for maybe Durant and Edwards, that you listed above are distributors. They have great court vision. Dame is one of the best pick and roll point guards in the league.
Dame - 7 assists per game / 2 turnovers per game
Luka - 9.8 assists per game / 4 turnovers per game
LeBron - 8.3 assists per game / 3.5 turnovers per game
Durant - 5.0 assists per game / 3.3 turnovers per game
Edwards - 5.0 assists per game / 3.1 turnovers per game
Jokic - 9 assists per game / 3 turnovers per game. 
Giannis - 6.5 assists per game / 3.4 turnovers per game
So looking at that, Dame has a 3.5 to 1 assist to turnover ratio. Giannis is at 1.9 assist to turnover ratio. Dame should be handling the ball. He's a bigger threat from deep. He's better at running an offense. It makes no sense to have Giannis bring the ball up the floor regularly.