At some point seniority is money if it gets you into a higher paying job.
Just spoke with a 1 yr LOS DL guy who'd been looking at AA. Obviously he's much better off at DL right now. At the end of his career is seniority is better at AA and the pay is the same (assumes DL 20% PS/3% PS AA).
If he was a new hire at AA and DL today he'd probably be better off at AA. He definitely would be at the end of his career.