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I don't think this argument in particular stands well against realityI think it does. I mentioned the salaries and perks offered by tech companies. I could also mention Henry Ford.
If something benefits the company then they will do it, and if it works it will naturally spread.
> Things that are in the interest of individuals rarely "sort themselves out" without some intervention
I didn't write "in the interest of individuals", I wrote benefitting both sides, which means, crucially, also benefitting the company. But again, in many cases happier employees simply do not provide a net benefit to the company.
Back to the point: The claim that unions benefit both sides is naive and a fairy tale. Obviously unions do not benefit companies hence why they are opposing them as much as they are legally able to.