I am a Dimond member and I changed my preferance for the Hilton Garden because my kid will be with me and I thought it would be better to have a Suite Upgrade and breakfest instead of points.
I have 2 queens reserved so I called to see if that would stop the upgrade and the hotel told me "We don't do upgrades because we are a franhisee and we don't have to follow the Honors program"

Guess I am going to take my 50 stays a year somewhere else