I can't imagine choosing the Taichi over the Auros Elite. The x570 has PCIe 4.0, supports more RAM and faster RAM. The X470 doesn't have any particularly compelling extras to choose it over those big spec increases for the X570.
At this point the only reason I'd ever choose an x470 is for a mid budget board. Although I'd likely choose B450 for a budget board. Once you hit entry level X570 pricing. It is X570 all the way.