Booker just needs to get better on that side of the ball. I mean you shouldn't be one of the worst defenders in the league if you're going to be a max player. I know a guy like Wiggins is a max player (though of course no one thinks he should be a near max player), but he is quite a bit better defender than Booker at this point....though last year in his 3rd year he wasn't any better than Booker is now, so maybe Booker can improve too.
But we can't be avoiding an elite talent because Booker is such a poor defender. Young could be Steph to Booker's no defense Klay for all we know (Yes, I do think Booker is better at many things than Klay, though worse at others). The point is this team is in no shape not to take the BPA for today's game.
If he is there at 5, no way do I pass on him provided Doncic, Porter, Ayton and JJJ are gone. I probably wouldn't pass on him at 3 if Doncic and Porter are gone (and it would even probably be a tossup at 2 between him and Porter with Doncic gone). C's are beginning to become a dime a dozen and even top tier prospects of a few drafts ago are playing on QO's or on their second team barely getting minutes....other decent bigs will be available. You don't come across an elite shooter and passer like Young often. I don't even remember a guy ever leading the NCAA in points and assists.