You are comparing 23 and 24 year olds with a boatload of experience to 21 year old kids with little in comparison.
Is that unfair? You have to compare to make a choice, no matter the age difference. A good sign that you’ve found an elite player is that they outperform older, more experienced players. You see this across all sports.
It is reasonable to expect that a #3 pick should outperform Bo Nix across many attributes and metrics. Not all, but many, and for critical ones in which he falls short there must be a reasonable expectation that he can catch up.
Is accuracy one of those attributes that can be corrected? If it’s footwork, maybe. I don’t know enough about the game. What about processing? Can a below average processor that makes the wrong reads in college or that gets stuck on his first option become a good one at the NFL level? Maybe, but I’m unaware of an example.
Again, I wouldn’t be surprised if the Nixes turned out to be the best QBs in the draft, as in,10 years later those two guys end up having the best careers. Perhaps more experience in college does yield a better career, on average.
Granted, I don’t have much to go on, and I’d still take a shot at one of the top 4 at #3, but I’d definitely be tempted to grab one of the Nixes later in the draft as insurance.