For those looking at expanding the SATA, NVMe, and/or the USB/USB-C capabilities of your system, the Lekuo SouthBridge Max PB65MX3 is an interesting creation that I have been trying out.
The Lekuo SouthBridge Max puts an AMD B650 chipset onto a low-profile PCIe add-in card to provide all of the above without any bifurcation required.
Given that it's an AMD B650 chipset, it also "just works" nicely under Linux.