Yes, they could do that, but remember that the more "guaranteed" room categories there are, the more it will limit availability. For instance, can you imagine calling for an MK view, even at 8 months before it opens to the other owners, and having to move several times because nights aren't available for your entire trip in one "guaranteed" MK view area?
I totally agree with Chuck. With multiple categories, there will frequently be periods where (for example) Sunday & Monday are available in "Preferred MK View" while Tuesday - Friday are only available in "Standard MK View." With the dual categories, a guest has to choose the split stay to lock-in their reservation. But with the single "MK View" category available now, the entire period would be available for booking
Adding more categories also increases waitlist volume and the associated administrative expenses. Instead of being satisfied with the general "MK View" category, those booking "Standard MK View" will often waitlist for "Preferred MK View" when point values are the same.
No matter which resort we're talking about, there will always be rooms deemed "better" or "worse" than others. We've always been told that requests are simply requests and cannot always be granted. I'd like to think that we are all tolerant enough to take the bad with the good. It's pretty obvious that a 14th floor room will have a better view than a 3rd story room, but every single night of the year SOMEONE still needs to stay in that 3rd floor villa.