Omicron may be "mild" to healthy, vaccinated people, but it's a serious, deadly health threat to the unvaccinated elderly.

Accordingly places where transmission is likely (eg. a small intimate restaurant) are serious and potentially deadly health risks to the elderly, unvaccinated part of the population.

So long as our hospitals are overwhelmed (as they currently are) it's a very bad idea to open up these high transmission areas to unvaccinated people, as they'll inevitably catch the disease and are so much more likely to end up in the hospital in ICU.

This is why restaurants/bars/etc should continue to have vaccine mandates even though so many people are vaccinated.

The point isn't to coerce the last 10% into getting vaccinated. It's to protect the hospitals from being overwhelmed by new cases from the unvaccinated.