I take nothing away from Jackson because he's actually proven to be the exception to the rule but the NFL will always be a pocket league. Doesn't mean you can't break it and make big plays but long term success is generally associated with the ability to read and throw from the pocket, even for scrambling QBs.
Yes......Ideally ya want to sit in a "horseshoe pocket" like Dan Fouts use to do and have time to get through all the reads.
However......Moving around outside the pocket is not always synonymous with just taking off and
running down field. When various mobile Qb's leave the pocket, many times it's because
pass pro breaks down. Hence they'll move around and extend the play...to give the wr's more time to get open. ( I've seen Jackson do it, but his dumb wr's
don't always move to open space...they just stand there ).
Ok...so to your point about
"long term success is generally associated with the ability to read and throw from the pocket ". When extending the pass play.
.....the Qb is still reading the field. He's just doing it
on the move, behind the LOS.
Mobile Qb's from Tarkenton to R. Wilson have proven you can have long term success making pass plays in or out of the pocket . Yes....if ya don't have to leave the pocket, that's the ideal scenario