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The advantage of putting the stiffness in the spider is that you can make the wear part from thin flat stock, and you can use steel without a big weight penalty. The Raketa product does nothing the Zipp Vumachrono wasn't doing more than a decade ago, but a "big as possible" 12-bolt PCD and minimalist steel rings would be a greener alternative to all the lavishly shaped direct mount MTB rings we see these days.
gbj_tester
Not strictly the case, a lot of the direct mount chainrings can be made nice and stiff with less weight as they don't need to fuck around joining the spider too the chainring so the material is in the right place rather than making the interface work (although there's in interface in the centre and that's just what the marketing claims).