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...doubt these shoes would benefit me in a meaningful way at this point.

You would probably be surprised. Can you race at 8:00/mile? Do you not heel strike like you're pounding fence posts? Then they'll probably work for you. I've run 50 mile races averaging around 9:00/mile in Vaporflys, and I still benefited greatly, if only because my legs weren't as trashed as they might have been in other shoes.

I watched a video recently where a reasonably good runner switched from minimalist to vaporflys and it was transformative, I think you're underestimating just how significant the advances in performance shoes have been (as the article points out).

I can assure you that many super shoes will make you noticeably faster. Try them on in the store, you'll know right away. That being said, some of them (Nike's especially) are really hard to run in. Almost zero heel support, and so you do have to be quite fast to make some of them work.

I have run in Endorphin Pro 3's and they are super super stable. I've work them for very slow ultras as well as fast workouts: excellent shoes all around.