Alex Hutchinson writes, "If they banned the Vaporfly effective immediately, they would screw over runners ...[who hadn't used the shoes to hit qualification standards]; if they banned it retroactively, it would screw over those who had already notched qualifiers in it. By deploying the shoe without asking permission, Nike effectively checkmated World Athletics."
The professor doing the study claims that they are even 2.6% faster than track spikes.
Alex Hutchinson plots the top 100 marathon times for the past decade and concludes that the recent improvements in times in 2016-2018 "aren’t noticeably bigger than the fluctuations in annual performance in previous years." Also, if it was really just the shoes, there should be a bunch of 2:04 guys running 2:01-2:02 like Eliud Kipchoge.