I certainly accept that vaccinated people will get omicron infection, although trying to ensure that people have had recent boosters will reduce that somewhat. The issue is with hospitalization rates, because there isn’t sufficient good data on omicron hospitalization rates in that group that have never had any exposure to covid and are not vaccinated.
And I turned on the news today to find that a recent arrival from the UK broke their at-home isolation (after 7 days in managed isolation), and went out on the town before they had returned a negative 9-day test. Of course, that 9-day test was positive for omicron, so it looks like we don’t get January free from omicron after all.