It's more efficient for the airlines, while at the same time being more flexible for pilots.

The trick is to not let the airline have so much control over that efficiency that it degrades pilot QOL and flexibility to levels worse than line bidding.

Frankly I'd rather have PBS even if it cost me a day or maybe even two at home... often being able to pick the days at home is better than me just being home when the family is otherwise occupied. But I don't think it has to cost you anything, that's mostly in the pairing build.

It can be a win/win. Any airline will probably take more than their fair share of the win... if you let them.