The ability to move airlines and not have to start at the bottom again has several advantages for pilots
As mentioned it is a zero sum game. An advantage for one pilot is at the disadvantage of the next.
Seniority is a pilot initiative not an HR one.
If HR had thier way it would be yes men that get ahead, and the crusaders that have often fought for improvements to your conditions and causes would wither on the vine.
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HR also nowadays have more influence on Ops, and have determined that it's cheaper to hire DECs than it is to upgrade FOs [QUOTE]
Exaclty why seniority serves to protect those FOs that we once were ourselves.