This is an unbelievable debate for me as a citizen of a smaller city with a much less developed system. Our system is so far away from being able to accurately time trains like this that asking whether it should be door close or train moving is like debating how many angels can dance on the head of a pin. I travelled to London a few weeks ago and was shocked that the trains would come when the schedule said it would. I'm used to +/-5 minutes on a good day, but with the max delay much worse than that.