He needs to add a 3 ball to his arsenal to keep defenses honest.
Can't have an offensive liability, no matter their defensive contributions.
He does have a 3 point shot, he just doesn't get much playing time to show his wares. He shot 37% his junior year and 35% in his senior year in college.
In comparison, Dorian Finney Smith is a career 33% three point shooter. So in that range, that should be adequate for what he provides on the opposite end of the floor. His ceiling is pretty much strictly 3&D player IMO.