I was always torn about the implications of Vaporflys. I can respect the fact that they skew the competition, but how is this any different than cycling? Pay a ton of money to reduce drag coefficient, moment of angular inertia, and weight to maximize energy return. The article even points out similarities in midsole thickness, ZoomX foam, and the Carbon fiber plate with other previous shoes that were completely legal with the IAAF. I love my Vaporflys and I run noticeably faster in them, but I think the most underrated thing about them is that they're way softer on the joints, and greatly improve running stability. They have the potential to make running safer and more accessible. Personally, I'd rather see more people maintaining and improving their fitness than some legacy goal post.