If, as magrate said in one of her later posts, people are crossing the stop line on green and then slamming the brakes on, because the light has turned amber, then she is right, they are wrong to do this, and they should complete the manoeuvre. She has said that the stop line is a long way back from the actual junction, so the lights' sequence should be set up so that a car that crosses the line on green will have time to finish crossing the actual junction before the lights go green in the other direction.
But she would be wrong to say that you should not stop if the lights change as you get to the stop line, and that is what my understanding of her OP is.
I have been far more aware of my stopping distances since an incident last year, when I was on the motorway. Thankfully the traffic was moving fairly slowly, and I had a good space between me and the car in front, because his exhaust fell off - a cylinder of metal some 8" in diameter and about 8" tall, with the exhaust pipe attached, came bouncing down the carriageway towards me! I had seen that it was flapping loosely in the breeze an instant before, and was decelerating, but I still ended up driving over this lump of metal (if I had swerved, I would have caused an accident, because I was in the centre lane, with traffic in both other lanes - including a big artic, in the righthand lane).
I did an emergency stop as this thing went under my car. The car behind me stopped safely, and then went round me and carried on his way. The van behind him also stopped safely, but the van behind him was driving either too close, too fast or inattentively, and crashed into the first van. I have been called to court as a witness in the prosecution of the second van driver for his careless driving.
Ever since then, I have been very careful indeed to make sure that I have plenty of stopping distance - frankly, I would rather have a bit too much than too little.