What if there are no usb slot in 20 years? I cannot rule out this possibility.
You will simply plug the floppy disk adapter in the matrix /tesla /ohmibod whatever their name will be in 20 years slot

That's what adapters are for!
Yes, this is what I said on my post, but nobody read

There is always a long time of transictions
Even now, I can find in a few minutes how can I buy some device to read my floppy disks