Is Mahomes mobile? Allen? Jackson? Watson? He'll even burrow can run when needed. While I definitely agree with u on Cunningham.. mobile QBs that have accuracy are what the league is now. All those great QBs I've mentioned are just that GREAT becuase they are accurate and Mobile.
Talking QB mobility, there's 4 levels: RB ability, escapability, pocket mobility, and unexceptional. Jackson, Fields, Allen, Hurts, and Watson have RB ability. Mahomes, Prescott, Murray, Purdy, Daniel Jones, and Wilson have above average escapability. That's what I'd call the top 11 in terms of mobility.
Then there's Burrow, Herbert, Lawrence, Rodgers, and Tua who are all very good at pocket movement (Brady was in that group), and there are other good QB's that aren't exceptionally mobile: Cousins, Stafford, Geno, Goff, Jimmy G, & Carr. Of those 11, you can win a SB with most of them, and some are top-8 QB's even though they're well into the teens in terms of mobility (see SI's top-10 QB list).
So I reiterate that mobility isn't everything.