I get that and I actually like TT for what he is. But in the limited number of snaps NP has taken, he's shown an ability to make pre-snap reads and throw with anticipation. I'm not claiming he'll be a savior, but TT doesn't do that and probably never will.
Whether or not he'd be able to actually get the ball there is another question, but it's undeniable he has a skill set that TT does not have. How that plays out, no one knows. NP could end up being Tuel/Brohm/Levi Brown 2.0 or maybe he's got something more.