Hooray for just-in-time scheduling where workers have to be available full time but rarely get scheduled full time. It’s an innovation that has been great for capital and terrible for labor.
The reality is that requiring benefits imposes a cost, and employers manage that cost by limiting who qualifies. So yes, this hurt many workers - and disproportionately impacted disadvantaged people who didn't make the full-time cliff.
Ignoring increntives is actually shaking your fist at the sky.
Typically the real disagreement here is over whether workers should get benefits at all.
EDIT: can we get another `vouch` or two for groundzeros2015's currently [dead] reply? It's well-argued and an olive branch and deserves to be visible.