The currency I used to do so also didn’t decline or rise in value by 5% in a day, which would have been awkward.
It doesn’t matter to me if banks exchange csv files at midnight to settle that, or what other archaic processes they use, because the verified identities and trust allow that to seamlessly happen behind the scenes without involving customers. The end user experience is all that matters here.
I use gold, my gold is always worth the same amount of gold. No dumb fluctuation and I have no problem in finding people who will take it. One second to transact? My handing the gold to anyone I choose is instantaneous and can be done in private. Gold solves all these problems, anyone not using it must be naive.
As I've already explained multiple times, it's neither meaningfully free nor instant. If you didn't understand that when I explained it in the last post, I'm not sure how I can make it more clear.
But I think you're also wrong about:
The cost - it really is free, there are no hidden charges on the bank account or for any party involved.
The transaction time - it really is settled that quickly between banks in the UK at least with faster payments. It leave my account and appears in the other one within seconds, sometimes within 1 second.