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I disagree. The cruise takes several days to weeks, whereas a flight takes hours and you can put your shaving gear in the normal luggage.

Unless they were bearded ;)

Hmm, I guess they could confiscate the blades and let you keep the shavette or DE. Losing some blades is not too bad.

You could hazard a shavette or DE. I don't see how a DE can be turned into a weapon, nor would I miss my shavette terribly if it was confiscated.

Or grow a big beard and have your best shave yet...

I fear it depends on who checks your luggage. If the Royal Caribbean says "Personal grooming items such as", that will be interpreted differently by different people. You could defend that a razor is...