The link you provided says this about Platinum membership:
"Preferred Rooms Upon Arrival
Enjoy a preferred room including rooms on higher floors or rooms with preferred views, based on availability upon arrival"
May they could have acknowledged this benefit, and said that there were no preferred rooms available when I checked in? Since they didn't, I don't know if it is the case of staff not understanding this benefit, or if the preferred rooms were indeed not available.
Just a few days ago, Hyatt Regency Mumbai, upgraded me to club access with breakfast and airport transfer. But that was probably an exception.