Thank you very much for your comments.
I realize that a small diagram would have been welcome from the start, my apologies.

When I talk about mass adoption, I also mean business accounting, for small shops and so on.
Keeping dual accounts (in MXN and USD, for example) is not easy enough. If, on top of that, you add a currency whose subdivisions have nothing in common with existing currencies, nobody's going to understand it. And it will piss everyone off to deal with satoshis.

Also, I haven't found any answers, but does anyone know why Satoshi Nakamoto decided 1 btc = 10^8 sat? Why 8?

https://www.talkimg.com/images/2023/08/17/MAzy8.jpeg