I am wondering what RCL intends to do with Harmony, and their other ships in Europe. Harmony is supposed to be sailing from Barcelona, Rhapsody from Venice, Jewel in Sweden and Denmark, Anthem in England which makes sense with what you've said above.
I'm in Canada so can't go (no vaccine and too many hoops for travel right now) but I will be interested to see if vaccinated Americans are able to travel to Europe this summer. Since the US roll out of the vaccine seems to be moving a lot faster than other countries.