We're 6-5 for a lot of reasons not just Roach, and that includes Jalen Johnson's propensity for not protecting the basketball and committing a lot of turnovers, two things you don't want from a primary ball handler. Also, Roach and Johnson play at the same time for many minutes in a game. If you are suggesting that Johnson actually take Roach's minutes at PG so that we have "a guard who can help us score" keep in mind what that might mean for the rest of the lineup. Would we have Johnson, Goldwire, Steward, Moore, and Hurt? In which case we wouldn't be any better off. Johnson, Goldwire, Steward, Brakefield, and Hurt? Brakefield was a scorer for a while but like Roach is going through a rough patch. Even Johnson has had a string of games where he was a liability on both ends of the floor.
My point is, we're 6-5 because we have a lot of young guys who are and will go through struggles. We can take Roach out and replace him with another guy and either not solve the problem you think it would solve or create new problems. It can certainly be an in-game adjustment where we go with the guys that are playing the best in that game, Coach K is great at this, but I don't think it would be beneficial to bench Roach or significantly reduce his minutes in the main rotation ever game in favor of Johnson at point (who, again, is turnover prone). Not to mention that taking Johnson away from the basket and making him run the team takes him away from what he does best for this team. He's not a particularly good outside shooter. We need him working inside and getting on the boards.