Well, it's true to a limited (but often exaggerated) extent that tech used in JSOC or other Tier 1 units eventually filters down to the grunts, but the limiting

Well, it's true to a limited (but often exaggerated) extent that tech used in JSOC or other Tier 1 units eventually filters down to the grunts, but the limiting factor here is that the folks in CAG etc are operating at cognitive abilities way above the standard infantryman (sorry, it's true). So things that are interesting tech (NVGs) that are easy to use, yeah they will filter down. Suppressors being standard for USMC infantry units is another example. "Push button, see at night" and "screw on, shoot gun more quieter" vs "N hours of training and re-learning your field craft to distribute the weight".