I also found it interesting...
Azamara only has two ships - so they are limited in where they can go, but it seems to me Alaska would be a great place for a smaller ship.
But almost ALL of the R-ships (all 8 of them) seem to go to Europe every summer as far as I recall. It might be different this year.
I asked Larry Pimentel last year why all the R-ships go to Europe when the goal seems to be differentiating them. He basically said they go where the demand is.