Given that power correlates to vO2, and in running it’s easy to run by feel or pace depending on course and conditions, what’s the gain in having a power meter? In cycling it’s obvious. What is it in running? I can go to a track and do intervals off pace perfectly. And in a race I am RACING, not trying to hit some power number. If I need to cover a surge, I will cover the surge if I feel I can. Or I can sit on a certain power and lose contact? WTF, no way.
I train completely by power on a bike. It works. In running no one has convinced me there is any benefit, and every single person I know who tried quit it fairly quickly for that reason.