While I think there is some merit to your thought process, I don't agree with the premise. I know some ultra-light runners and fast hikers, they clearly know that they are lacking in emergency gear and that the odds are long, they will pay for that transgression. It's a simple roll of the dice, once in 100 hikes, you may come up snake eyes. When I pass hikers on a nice summer day and they have tiny packs, sometimes I feel like my pack is too heavy. BUT, I have spent time out injured, once for almost 24 hours in severe pain the whole time. But I was warm and had food and a decent first aid kit, I used pretty much everything in my pack that day and night. Plus, I carry even more crap for my dog, rescue harness, vet tape, first aid. One thing I did agree with in your post ( I actually agree with many of your post) I do believe in getting better at my craft, I've read 100's of books on mountain climbing, I take pride in my skillset, it did not come easy, I assure you that. We all make decisions in life and we live with the consequences, as it should be.
AS for this trail runner, he came up snake eyes. I am glad he is ok and it wouldn't surprise me if his pack got heavier for his next trip.