Ah, yeah I totally agree with your reasoning on all of the points. But I guess if you really want good copies of all 8 of these records then the box is the way to go. I really doubt these RKS cuts will be floating around outside of the box, but you never know. IMO, Motown originals largely suck even on the rare occasion you can find silent players, and the 80s reissues are better but still not amazing, especially considering the stereo was preferred on that series, so I would love it if these got separate releases. But yes, for me there aren't enough ringers in the box to go for it, especially since only two of the LPs would be on my "must haves" list.
For VMP that hasn't seen re-release since, I think the exclusivity is really in the cut / mastering. Outside of Demon Days i can't really think of a record that VMP commissioned a quality cut for that the label reused the same exact stampers. That's why I have little to no interest in lots of their DMM GZ crap, anyone could release that easily, and exceed it with minimal investment.