Totally agree
Because of difficult availability of laptops and computers (with big nvme drives) some companies are buying what they can get and then replacing disks to something better. Thanks to that 256GB nvme are cheaper than good quality SD card and much more than eMMC.
Of course if You already have some eMMC still it’s worth to add it but it won’t be faster or bigger than m.2
RaspiKey is not that wonderful solution. It’s not compatible with every reader and device, still uses UHS-1 so won’t be better than good SD card. It’s big and expensive sd card, I think it’s just better to get any “high endurance” sd card than this. My raspikeys are not working on any pcie reader so I don’t use then at all.