The whole, "but I paid into it", argument shot to hell. Good analysis, I am 64 and have not signed up yet. You have added another reason to postpone or waive my "safety net".
I’m not planning to collect until I’m 70, so I can get the maximum benefit. However, if they raise that age to say, 75, I’ll try and put off retirement until I’m 75. I’ll make it work somehow.