Apparently a lot of people forgot what it is that "longevity" gets you in this business. It gets you:
Prime vacation slots
Weekends off flying
Holiday off flying
Desirable layovers
Widebody int'l flying (moot)
Pass riding rank (moot as that would likely remain DOH for everyone, and I could care less if it does as far as I'm concerned)

As someone else noted, career expectations are the same at AS and VX; narrowbody domestic flying with some Mexico and Hawaii flying.

Anything other than relative seniority is a straight up quantifiable windfall for AS pilots for the items listed above that aren't moot.

If you slot VX pilots somewhere down the list and not relative, a mid or junior AS pilot who has no expectation of holding those things will now be able to hold them. Those things will be taken from senior VX pilots. That is a windfall. VX is bringing flying, vacation slots, weekday trips, holiday off trips and tropical destinations with us. If you think it's fair to steal that from people you're delusional. Why would anyone care what "number" you are on a list as long as you have the same QOL you had and expected?

Even with relative, VX pilots stand to lose quite a bit in terms of QOL with AS rules. 75 hour min all year with flex up from there vs 70 with flex up to 75 six months/year? That's 1-2 less days off/month. That archaic line bidding BS with no transition or conflict language that forces you to get yourself back over 75? Complete garbage. VX has A LOT of commuters, and these two things alone are going to destroy the QOL a lot of VX pilots have come to enjoy.