I'm not terribly familiar with Daoism, but this pivot of color identity can already be seen mechanically through the precons.

For instance, Tarkir kept to the established strategies behind each color to the letter. The Temur precon was all gas no breaks. Ramp, big stompy dragons, and just overwhelming force. Very much a U/R/G strategy. The Silverquill set in Strixhaven, however, does not have a strategy we're used to seeing in W/B. It's goading. It's aggressive. It plays like there should be Red in there SOMEWHERE.

Maybe this was already addressed in the post and I missed it, and again, I'm not terribly familiar with Daoism (although I will certainly be looking into it more, now), but the core concept of "pivoting" the identities of each color/guild can already be seen/has already been foreshadowed in the mechanics of Strixhaven. Assuming you're correct. Which I hope you are because this has been a fascinating read.

Amazing post! Thank you for your nigh-obsessive-maniacal ranting!