That question assumes there's some sort of carefully designed prioritzation rule set. Considering how arbitrary upgrades tend to be, that seems unlikely at most properties.

I assume there's some effort at most properties to assign Elite guests to better rooms or onto "Elite floors." But when an overworked room assigner needs to assign 100 arriving guests to 100 rooms that have other guests checking out, the highest priority is probably just to get the bed types and room categories right, and to make sure nobody is put into a suite for several days that's needed for a paid reservation a day or two later — and to get the job done.

Yes. That would be good business.