@breadsmasher
Great question! "Need" probably isn't the right word. "Strongly desire" or "greatly prefer" would more accurate.
The reason is that I have lots of different devices with different port types. Some of my newer devices only have USB-C ports, while my older devices only have USB-A ports, and I'd really like to have just "one key to rule them all," so to speak.
I know that I could buy a little USB-A/C adapter dongle and keep that on the same keychain with the MFA key, but that introduces a degree of fragility that I'd prefer to avoid if possible.
That being said, if I found a hardware MFA key with all of the features I listed except for USB-C, then I'd happily accept the dongle compromise, because most of my devices (even the old ones) support Bluetooth, so I'd still have that as a backup option in case the dongle fails.