I think you’re misrepresenting how many words it takes to fully get across the FitD rules approach and related GM guidance. In the case of SaV I agree that the setting stuff is pretty pointless, even though I know people who’ve been really happy it was there, and I’d argue that you or anyone else could easily take the stance that a setting-less core book is just an incomplete game, especially if, as with SaV, there’s no additional line of products published or plannedScum and Villainy is actually a perfect example of what I'm talking about: that game should be about 50 pages (and could probably fit on two pages plus playbooks, but that's a different thing). Instead it is a couple hundred pages of self indulgence.
But never mind all of that. You aren’t addressing what @Ruin Explorer and I have both brought up, which is that page counts mean are arbitrary and mean nothing! You’re still tossing around page numbers as though every book has a set word-per-page count.
If anything, what you really seem to be talking about is great games with no real setting. That’s a fine category and discussion topic, but this “thin” book business is just odd.