As pilots, we have very short memories. If you'd have asked the pilots their opinion of PBS when we were using it, there was an overwhelming hatred of it. How do I know, I asked. It was amazing when the line bidding was leaked out for this contract. By a ratio of 3 to 1, the majority were glad to be rid of PBS. I warned them of the hazards of line bidding, but they didn't care.
Now fast forward to today, everyone hates line bidding.
The union had a lot of labor in the PBS system, reviewing (scrubbing) the results and many times needing to intervene, and very little was reviewable for the line guy. I agree, easier for the junior guy.