@tk yeah, main issue is that mainstream desktop platforms like am4 and am5 only have like 20-24 pcie lanes. Most graphics cards use 16 of those lanes, and then each m.2 SSD will use 4 lanes each.

Boards with more than 2 m.2 slots can either use additional PCIe lanes from the chipset or take some lanes from the GPU. But since the number of PCIe lanes per device has to be a power of 2, it means the graphics card will end up with only 8 lanes

Whether that matters or not really depends on what you want to do. Gaming wise going to 8 lanes of PCIe 4.0 might not be a big deal. Not sure about how much it would affect AI stuff though