OK, I have to disagree with this.
I'm not one of the ones here predicting multi-year disasters for the post-Wilson Seahawks (much less hoping for the post-Wilson Seahawks to suffer much failure like a few on .NET appear to be), and I'm on record here on .NET stating that I think that at some point this season, talking-head mediots will be wondering how the Broncos' offensive line got so much worse so suddenly. I also coined the (admittedly at least slightly unfair, but it still makes me chuckle) nickname "RW3-and-out."
But even though I don't think Wilson going to the Broncos will be as great for the Broncos as many appear to think it will be, nor that it will be as bad for the Seahawks as many appear to think, I sincerely cannot find any decent argument for Mayfield being better than Wilson.
Regarding your arguments specifically, I really don't see Mayfield as being that mobile. As for being quicker at making decisions, it seems to me that the real issue would be some combination of speed and quality of decisions, but I honestly don't have any data on either immediately. The reason I think the combination is better than just the speed is because f a player decides very quickly, but is very frequently wrong in the decisions he makes, that's not a good thing. And I say this without knowing if there are numbers showing Mayfield being faster at decision making than Wilson or vice-versa. What makes you say Mayfield is a quicker decision maker? Do you have any statistical evidence of it? Do you think he's a better decision maker? Why?
In any case, iin terms of actual on-field production, Wilson has been much better than Mayfield, and I don't see any reason to think it'll be otherwise in 2022. Decision making is one of the components of a QB's job, and what actually happens on the plays as a result is what's measured by the various stats. No matter who's a quicker (or better) decision maker, Wilson's actual on-field results have been significantly better than Mayfield's.