I don't think this comparison is technically meant to be taken literally.  I think it's more of a figurately speaking type of thing.  It is a good analogy in my opinion. If you are old enough to remember when computers and the internet became cheap affordable enough to be placed in homes and schools, then you will remember how basic things were.  For example computers were much larger, slower, more expensive etc. Just kind of like how bitcoin is right now.  It's still a major modern technology breakthrough, but it's in its early days.  Wallets, while having gotten much better of late, could be comparable to say a floppy disc.  In time wallets will become much more advanced and efficient.

There's a reason Andreas named one of his books what he did..