He's going to be able to get to the paint and draw lots of fouls and score lots of points.
At Kentucky, the lane was rarely open, because Randle and WCS/Jakari/WCS were always under the hoop.
In the NBA, there will be more space in general, and on the Celtics there will be an open lane to finish at the rim. Every big on the Celtics can shoot an outside jumper and spread the floor.
Young is just going to get better and better at handling the ball and using his strength, quickness, and long arms to dribble-drive to the hoop. But he'll also get lots of close-out opportunities to pump fake and drive past a rotating defender closing out on him.
He really could be a weapon for us as a plus size 2 guard, and he's only going to get stronger and a bit more athletic.