@john I still find it confusing. (1) I only know that if you do Standalone mode (shorting SPI enable/disable jumper), then you can manual/software config 2130, and use siggen or python GPIO steps to move motor. (2) If you use SPI mode, the problem is that two SPI pins clash with Mg1/2 pins, ie you can no longer manually config things, uStep resolution etc. You can only use SPI to config, but then troubleshooting become difficult.
(3) I found a new version of 2160 seems to have a workaround (see my last post about 2160). But I only bought this 2160 recently. So I need to explore a bit. Stay tuned. (4) You mentioned that tmc5xxx need external power MOSFET bridge. But my version of 2160 (perhaps other versions of 5xxx) module has the bridge already assembled, with a huge heat sink. So I think it is good for CNC or 3D printer projects where you have ample space to house hardware.
Discussion between john and tlfong01
Discussion between john and tlfong01