Agree with the three above.
I am one of these dirty rotten A scalers and like all my aviation brothers, we are VERY happy with this PBS system. Why is it fair that someone who joins the company now has the pick of the trips when I and many others had rosters that brought grown men to their knees? Too many 24 hr rest periods, the 0210 four sector as mentioned, etc
We have this seniority based system now almost as a thanks and well done for putting up with so many bad rosters during the last few years. It ain't gonna change and so if you don't like or don't want it then please do not sign your contract and if you do sign then stop bleating about how you consider it to be so unfair and instead put the time in because as MCO says, you seniority is only ever going to go up.
Oh and by the way it's not only PBS's fault if you get a bad roster. I have seen some shocking bidding and frankly it's a wonder that people complain when they have done such a dross job in bidding in the first place.
It's a bit like an FMC, crap in - crap out.