I'm sort of in general agreement with you about healthy running practices, but I don't think endurance running - just running for long distances with no eye on time - is a good comparison with performance running - where timing is key, even if you're running log distances. It's to do with the purpose of the running. Eliud Kipchoge only broke 2 hours because of the shoes he was wearing, which are only used for one race, so you're mixing the two aspects a bit there. There are also issues with running on the balls of your feet. I injured my metatarsals by running like that, and they only recovered when I reverted to a slightly flatter running style. The choice isn't just between "ball" and "heel", there's a grey area in-between, and the thing I distrust about alot of the "natural running" stuff is the ideological purity that it often engenders.