His jumpshot looked like it had potential in college but needed work. A three point shot opens up the rest of his game. It's why we discuss how much Ben Simmons sucks ad nauseum because lack of shooting hurts the team and his own numbers in a big way.
Collin Sexton 33% -> 37%
Kawhi Leonard 25% -> 38%
Mike Conley 30% -> 38%
Kyle Lowery 32% -> 36%
Jaylen Brown 29% -> 37%
Kemba Walker - 32% -> 36%
Jrue Holiday 30% -> 35%
Channing Frye 26% -> 38%
Jerami Grant 30% -> 34%
TJ Warren 31% -> 35% (above 40% last two seasons)
Pascal Siakam 17% -> 32% (brought down by rookie/sophomore years, currently 3/4 last seasons shooting above 35%)
There's a number of big men that never dared to take threes that have developed into solid/good shooters. Okoro has the odds stacked up against him, but to say it almost never happens is a bit extreme