Also you can get a raise without "costing" anything extra in the expense column, such as fewer working hours for the same pay/benefits.
Things like making sure that AI isn't used in certain capacities to reduce the staff size wouldn't be unreasonable.
As of yet, the contents of the negotiation aren't public - so we can only guess.
In the meantime, the idea that everyone should be able to make Big Tech wages ignores the reality that most companies aren't Big Tech and have a revenue per employee that is a small fraction of it... and are running on much slimmer profit margins.
Yes it would. Explicitly demanding inefficiency is exactly why unions are terrible for innovation and progress.
If the union workers think that management would like to cut things so much that it will cause the quality of the resulting work to suffer drastically, to say nothing of their health, then they're not arguing for inefficiency.
And if they don't trust that any sort of metric for "good enough" wouldn't be gameable since the management has more expensive lawyers to write contracts than them, a blanket rule makes more logical sense than trying to bet you didn't leave a loophole.
(All opinions my own, obviously.)