I don't begrudge Smart for taking the opportunity in LAL. It all comes down to his health and durability at this point in his career. He has not had it the last few season.
As to the Lakers rotation, I am not sure what Hachimura is. They may be better off with Doncic, Reaves, Smart, LeBron, Ayton. In any case, I bet you see a lot of that line up through the season.