Massachusetts did this last summer. Seems like a strange trend. Not necessarily bad (though it makes things harder for me as a hiring manager) but I wonder what group is pushing for this. Laws don't tend to get passed unless they're backed by special interests.
I'd say that preventing potential employers from asking questions about salary while allowing applicants to ask whatever they want is creating, not removing, assymmetry. In both cases, parties are free to refuse to answer questions.
One could argue that the potential employer is in a position of power and should therefore be constrained but I don't see that as the case at all these days, at least not in the tech industry.
