Higher comp is not a win if it comes with enough strings attached.

For instance, they could tie pay / layoffs to seniority (all your coworkers are unfireable incompetent union “good old boys” that don’t bother pretending to work any more, creating a hostile workplace and tanking company revenue), or the contract could make it unprofitable or infeasible to continue ramping up production in the union controlled facilities.

Since Boeing managed to remove the clause saying they’ll keep making planes in Washington, I’m guessing the latter happened with this deal.