If you're stable at 501RA, was your approach "safe/not dangerous"?
If you're stable at 499RA, is your approach "unsafe/dangerous"?
A line has to be drawn in the sand somewhere and this is where it lies. In your above examples, you are a better man than me to judge that the aircraft was stable within +-1ft! The safe/dangerous thing is not for us to judge, it is simply a question on whether you follow SOP's or not.