You can read for yourself what he wrote: https://bitcoin.org/bitcoin.pdf
Basically to be able to make “small casual transactions” without using a bank or corporate payments network, incurring large transaction costs, or having to provide personal information to merchants in order to prove you have the funds and are not using a stolen credit card or will otherwise get the payment reversed. Being a digital substitute for cash payments is explicitly mentioned.
Weaknesses of the design were clear from the beginning, and arguably Bitcoin has failed to meet some or all of these goals, but that does not mean they are impossible to achieve. The central banks themselves are interested in this problem,
including digital bearer instruments, though of course they have their own particular requirements, like potentially blocking use by non-Euro residents or restricting cross-border payments, that, if you do not like, you would have to operate your own, independent network.
To this day, we are hearing about people even in supposedly industrialized countries like the U.S. who are unable to make instant, zero-fee electronic transfers from their bank current account to another, especially across international borders. I recall there was a poster who said his or her bank wanted $35 or so for a wire transfer, which is insane even if they literally had to telegraph the order.