This is pretty demonstrably false. I have a USB-C port on my Windows machine and I just plugged in a TB3->TB2 adapter, then plugged a TB ethernet adapter into t

This is pretty demonstrably false. I have a USB-C port on my Windows machine and I just plugged in a TB3->TB2 adapter, then plugged a TB ethernet adapter into that. Windows machine pops up an error when plugging it in, no new devices appear in the device manager, etc. It will not "just work" when your USB-C ports are not Thunderbolt ports.