Right, but how much experience do you need? Its very common that after years of starting in college that if you don't already have it to some degree, you're likely not going to get it. JD5, Stroud, Mahomes... we can go further back and name dozens who came into the NFL knowing exactly what you're speaking of and building off it as they get more experience. Rattler is showing that he doesn't have have any at all.
You speak of experience as if time and trys fixes all for everyone. When what I see is processing and defensive anticipation. Winston was rarely a step ahead of the defense. Rattler feels the same. Except with Rattler it feels like the defense is two steps ahead of him.
It's like a 6th sense that develops better over time. Winston never had it and feels like Rattler doesn't either.