No one is saying the bench press is an important number, but it's the only strength number they give us at the combine. If you are in the gym working on your body, you are going to touch the bench press every now and then to keep your body balanced. I'm not saying I need to see 15 reps to be impressed. All I'm saying is that it's a reflection of work ethic and dedication. 0 reps is a red flag at his age. Don't use KD, a 19 year old who was a generational a talent from a size/skills standpoint, as a counterpoint. It doesnt fit. I bet you anything by the time he was 22 he could put out reps.
Frazier is a completely different level of prospect if he can play the 4, like Ariza does, but at 200 lbs with minimal strength and turning 22 in a few months, that doesnt seem likely.