Earlier quoted context omitted.
If it made no difference why would employees bother? It does make a negative difference for employers with potentially higher costs and lower flexibility over time.
It makes a positive difference for the employees. You seem to imply that this is correlated to a negative difference for the employer, which is completely wrong.
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 adopt it on its own.