When it comes to public health, consumer safety needs to be a priority, elevated above the ebb and flow of market forces, and properly monitored. It's not okay to just wait and see what the market does.
You may think you're in an idyllic, protected environment on a cruise ship, but, au contraire! You're in a bubbling stew of microscopic buggies, especially those norovirus bacterium that are just waiting to quarantine you in your stateroom, sitting on the john with your head in a bucket.
Social gestures are important to feel welcome, express trust, show gratitude, and conclude visits with a hopeful tone. Find the best way between you and your doctor to have these feelings, but do not increase your risk of infection in the process.
Plenty of things can go wrong on a cruise vacation. You could get seasick, or sleep through breakfast, or lose at blackjack, or puke over the rail, or god forbid be on a cruise ship that's lost power and drifting out to sea.