He does have some strengths, but they seem to be vastly outweighed by his weaknesses. For strengths, he is good at disrupting the passing lanes on defense. On offense he is a decent catch and shoot threat, and can get into the lane decently.
You've just described the likes of Danny Green. Having an off-the-dribble game isn't required for every player. Those who can play effective defense and sink threes on good percentage will always have a place in the NBA.
This is a problem because his physical profile is almost exclusively that of a 1 guard. He could play the 2 spot but he's undersized at the position.
Khyri is a shade under 6'4" in shoes and has a 6' 10.5" wingspan. He's all of 1.25 inches shorter than Bruce Brown, and about that amount longer. He'd be of slightly above-average size for a point guard, and significantly bulkier. He's somewhat undersized in terms of height at shooting guard, but not unusually so; he's (roughly) equal in height to or taller than Donovan Mitchell, Victor Oladipo, CJ McCollum, JJ Redick, Eric Gordon, and quite a few other players who have effectively played shooting guard in the NBA.
On top of that he's not a good enough scorer to really deserve a rotation spot, and hasn't showed enough defensive versatility to pull a Bruce.
He hasn't been given a chance in the NBA. And Bruce is not a good-enough scorer for a rotation spot. For the lion's share of NBA teams, his inability to shoot would have landed him in the G-League last season. He ended up in the starting lineup thanks to a combination of Detroit's desperate weakness on the wing and Dwane Casey's capricious lineup decisions. If Khyri can shoot threes next season and Bruce cannot, then Khyri is the more NBA-ready of the two.
We already have too many shooting guards and 4 point guards on contact, not counting Brown and Kennard who are capable combo guards.
Brown won't be a capable guard until he can shoot. No buts.
If I was the GM, and I'm sure many of you are glad I'm not. I would be looking to trade him for a future second, or a serviceable big to fill the hole.
Trading a guy who's got promise, after a single season in which he saw little time, and after trading two seconds for him, strikes me as poor lineup management. And I'm curious why you think a second-round selection who hasn't seen significant NBA time would draw the Pistons a fair backup center on the trade market in any event.