I think not knowing all of the details about the severity of the Omicron variant and its potential resistance to vaccines makes it impossible to have full confidence the existing measures would work. Until more is known, tightening restrictions rather than just hoping for the best is understandable. It's a hassle in some cases, but if it potentially reduces the chances I'll be on a plane in two weeks with Covid-positive travelers, I'm willing to deal with the inconvenience. Honestly, I'd feel better if testing was required to get into SXM like it was last year. I know that's not a popular opinion.