In general, why do we have to check to keep them honest? Why do we have to go through all that effort to prove that we got the room in accordance with T&C?

I stayed there on a FWN and got an upgraded room for sure but have no idea if I got the room that would have best met the T&C at check-in. There was no acknoweldgement of P status at check-in, nor was there mention of an upgrade when I received my room key. I only recognized that there was an upgrade at check-in from the room number and previous posts in this discussion topic.

Personally, I am struggling with this whole upgrade at check-in issue at Starwood hotels in general.