The Japanese already have good working exoskeletons and I know the US military has some prototypes. I didn't read the whole thread because TLDR but my two cents are that people wear kevlar because it's not super heavy but provides some protection. People use plates in their kevlar because regular kevlar won't stop rifle rounds. If you are rocking an exoskeleton, you can plate your entire body and not care about the added weight, in fact you can use double or triple layers of interlocking ballistic plates. And you can carry a big fucking gun while in it and it won't tire you. So yeah it's not going to make tanks obsolete, and it's still quite vulnerable to mortars and missiles and other stuff, but if you are going after a bunch of unarmored goat fuckers in the ME, then you will tank 90% of what they got.
But wait anon, in ancient war, you sen't all the strong men to war and they died, leaving only the weak and infirm to breed. Isn't that dysgenic too?