The simple reason for the necessity of glute activation is that you have been sitting down (or sleeping) for 80% of your life. That is no in itself a bad thing...we get an education sitting down, many of us earn a living sitting down, and sometimes it is nice to just sit down. But if you go 80% of your life without ever needing to use your glutes (and hamstrings for that matter) then it shouldn't be a revolutionary idea that we would have to work a bit harder to wake them up (Kenyans by contrast live a more active lifestyle and don't need as much of this).
This is one of the reasons for the "anterior pelvic tilt" described well by Jay Dicharry. Since the posterior chain is not working the way it was designed, we have generations of runners that are not in proper alignment trying to swing their limbs vigorously from an unstable platform.
Having said that, there is a lot out there that is "for profit" yet not ultimately profitable for the runner...buyer beware.