Where are we talking about experience disadvantage. We are just discussing priority. If there is enough capacity (i.e., reservations in dining rooms) for everyone, then all we are discussing is who gets to make first choice. Why shouldn't it be the repeat customer?
If the resource is limited (i.e., not everyone will get a chance to partake of the resource), then someone will be disappointed. Who should you disappoint; your good customer or one that may either be new or not so loyal? Remember, if the resource is limited, there will be those that are disappointed.
It sure would be bad for airlines to randomly give out upgrades to both their premier passengers and those that may or may not fly them again. Same thing with hotels giving out lounge access. Both of those segments have found out if you don't reward your loyal customers, they will become loyal to someone else.
I am not asking for a two class society (though Radisson does already give additional perks to their high end suites), I am asking that Radisson recognize their loyal customers. Most other cruise lines already recognize their loyal customers through a tiered reward system. Why shouldn't Radisson?