Why doesn't Andy step up in the pocket?

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Quote from PFF.

Quote:CINCINNATI BENGALS – ANDY DALTON

Weakness: Downfield accuracy outside of structure
Dalton has struggled to make plays outside of structure. Since the 2017 season, he has the league’s 24th-ranked grade on passes thrown at least 2.6 seconds after the snap (68.1) and ranks just 44th in completion percentage (49.7%) on such passes. With a porous offensive line, Dalton likely will have to deal outside of structure more often than most quarterbacks.

https://www.pff.com/news/pro-nfl-quarterback-kryptonite-the-biggest-weakness-for-all-32-starters