Earlier quoted context omitted.
Obviously in general it makes a positive difference for employees, that was a rhetorical question... I have listed two main negative differences it makes for employers. I am hard-pressed to find any positive differences for them... on the issues this touches it's pretty much a zero-sum game so if employees gain it means employers 'lose'. If something is positive for both sides then I think the market will eventually…
"If something is positive for both sides then I think the market will eventually adopt it on its own." Due to millions of regulations already in place, the market is not really free, but very distorted. So even if the "free market" would always go for the best solution, current state is nonproof for anything. Otherwise you might argue, that europe would be a proof, because unions here are strong.
So, yes, the market isn't really free, and never has been, when you don't selectively exclude some kinds of regulation from consideration.