There's not convincing data that this is any better for vaccinated people than Delta.
They're just more likely to get it.
In neither case were vaccinated people highly likely to get hospitalized, ventilated, or die.
In no world should we be celebrating people getting sick. Omicron is resistant to previous infection. It will likely mutate into something resistant to previous infection to itself.
It's good vaccinated people aren't dying. We still shouldn't cheerlead them getting Covid.