I noticed this too. My 2nd play through I purposefully wore power armor & took Preston along when meeting Danse for the first time, just to see variations in the dialog.
There is one other thing I found odd. I'd figure in Act II, the Brotherhood would continue to reclaim technology in the wastes. For instance: the 50+ suits of power armor that are (in some cases) just sitting on the side of the road. I was really expecting to get radiant quests to turn in suits of power armor.