Does weight matter?

One of the most vexing arguments in racing today is the impact of weights on a horses chances of winning, the old adage of “Weights stops trains” seems to be vehemently rejected by a large swathe of punters in the modern landscape. Some people when they see a horse on the limit, 54kg with a 3kg claiming apprentice taking the ride will literally jump out of tree’s to get on, I must admit I am one of those people, especially on a heavy track a big go to for me is weight relief, so I have given up my position on the matter I think it may be cognitive bias but I am convinced weights play a massive part.