Ummm.... First you posit a "new" way of looking at the interaction of cartridge, tonearm, and turntable which I think is leading to a defense of outboard tonearm pods. But at the last second, you swerve away from that issue and seem to posit that your Copernican view of the LP playback system somehow leads to the conclusion that a plinth is superfluous. As Archimedes might have said to his plumber, "It does not hold water".
As I have said before, the plinth issue and the arm pod issue are two entirely separate ones, except whereas the lack of a plinth makes it easy for you to get a bunch of tonearm pods nearer to the platter, so they can all be aligned properly. I don't think there is any argument that can lead to the universal conclusion that a plinth is never a good idea or never leads to a perceived improvement in LP reproduction. It is even conceivable that a good plinth can be more than just transparent; it can make the turntable (idler or direct drive) sound "better" than it does with no plinth. (Before I abandoned the belt-drive notion, I had come to the conclusion that for belt-drive, a big heavy plinth was superfluous and usually not a good thing. Most of the top end modern belt-drive tts seem to be built in accordance with that idea.)
I do think there are good arguments as regards independent tonearm pods, pro and con. I have stated my argument against them elsewhere, more than once. Here you have an interesting argument for.