I think this sentiment comes from the notion that employers should be the basis of the social safety net, which I find odd. Employers will never fully serve this role. It's relying on organizations (corporations usually) to make the trade off between profit and employee well being, two things that are almost always at odds.
It seems to me that it shouldn't matter where your income comes from, the social safety net should be there regardless. The ACA was a step in that direction by requiring people self insure if the did not get that benefit from their employer. I think we need to go even further and separate safety net benefits from employers. Then people would be able to choose whether they want the job security of a W-2 position or if they prefer the flexibility of a 1099 position without having to sacrifice the safety net.
(Side note: I'm a 1099 contractor who self insures. I have a lot of difficulty imagining going back to a W-2 job.)