As they should be. I was on Wonder in September and wore shorts each night in the MDR except on formal night, where I wore jeans to "dress up", but it wasn't really necessary, based on what others were wearing.
I'm very glad to see that Royal has relaxed their dress code... you're on vacation and should be able to dress how you want (within reason). Now, over on the Celebrity forum, they will run you off the ship with pitch forks for even suggesting wearing shorts to dinner. 😄