Ha, that's funny. I too thought that Grunt looks like a great figure, and I'll definitely need a few of them to customize into some additional characters... but my initial thought was, "Oh damn, gonna have to get rid of that plate carrier and get him one of Stalker's OG webgear. I have a blue million modern vests from all of the Valaverse fodder I've bought, and they just don't look right to me. Yeah, I know they're accurate for modern times, but they just scream "generic military" instead of "ARAH!". Maybe if I was creating a new character or customizing a specialized squad that needed some visual element to tie them together, such a vest would be useful, but on the Grunt character it crosses the line between realism and fantasy that sucks the fun out of Joe, IMO.
I mean, if you gave Quick-Kick a vest and boots and a helmet and an M4... is he still Quick-Kick? Or is he just an asian-american enlisted guy? Too much realism destroys Joe if you're not careful.
It is cool that they gave Grunt a SB helmet so he can be a greenshirt troopbuilder if someone was so inclined, but I never liked the idea of greenshirts. Sure, it's ok to have a few around the base doing the boring shit, but having them out in battle is basically the antithesis of GIJoe, a collection of super-specialists to make small strike forces to combat terrorists, not a full-fledged military brigade. There is no such thing as a generic super specialist or a elite-specialist in training... those are called basic soldiers and have no business even knowing GIJoe exists, much less participating in anything. I always thought of Joe as having much smaller numbers than Cobra, despite having more figures and named characters. Cobra has cells all over the world, Joe is just one little outfit.
IDK, I'm rambling now. But they make these odd choices that make you really examine what you like and don't like about the property! Clearly YMMV.