Earlier quoted context omitted.
I'm not sure that they have changed. People brought it up before and people are bringing it up now and they'll continue bringing it up. I think the tech workers are generally still opposed to the idea
Imagine how terrible it would be to be on a team with subpar engineers with some kind of tenure / union protection so they cannot be fired. I think this is a big reason tech workers are opposed to the idea.
It's not really a binary choice either. With unions it just increases the probability of you being on a team of terrible engineers while lowering the probability of you getting layed off.
So the real question is which probability metric is more important to you and other engineers?