Beno's not that bad of a shooter, but the difference between a Fisher type and Beno is that Fisher made a living by spreading the court. Being a spot shooter is incredibly important. Beno much like Tyreke is more comfortable gathering himself and making a move rather than shooting the ball quickly. That transition time from gathering himself virtually eliminates himself from being a player perimeter defenders have to stick to and therefore allows them to cheat inside and help. He's a good off the dribble shooter but having nothing but off the dribble shooters is a terrible way to attempt to spread the floor for the very reason I mention above.
That plus while people may have forgotten because he's fallen so far in this area, Fisher was quite the defensive player back in the day.
Fisher was always smart defensively, but was always overrated, if you ask me. Keep in mind I watched a lot of Laker games in the early 2000s, and I saw the Lakers struggle with quick guards every year. At some point in every playoff series against a quick point guard, Kobe switched over to guard him instead of Fisher. He was never all that good. Smart, heady, tough ... but ultimately a liability defensively.
As for his shooting, the thing we need is outside shooting, which isn't Beno's strongest asset, but it's not necessarily lacking either. He slumped for a while last season, but got it going for a long stretch.
But the question being "who's the ideal guard to play alongside Tyreke," I don't see what's wrong with Beno. He's not strong defensively, but that's not what we're talking about. We're talking about a guard who can co-exist with our ball dominant best player, and I think Beno did that just fine last year. For my money, he was our most consistent player last year, regardless who else was in the lineup. That's not saying much, but I do think he's kind of getting sold short.