Don't the ERC-20 tokens, the same ETHer, perform the same functions you specified and are more common?
They do not provide those functions sufficiently for SN to depend on them. Hypothetically, we can use pots and pans as money but I wouldn't. We choose to use the best money available as a matter of taste and we expect others would prefer to do the same regardless of the other assets they are speculating on at any given moment (whether that's Apple stock or Solana tokens).
are more common?
They are certainly more plentiful, and unpredictably so, if that's what you mean.

The bottom line is really that we aren't an exchange and we aren't a broker. We are a social economy and efficient economies have a preferred money and ours is bitcoin.
Great answer, thank you 🙏 Of course I still have a lot of questions, but somehow I'll figure it out on my own, have a nice day Keyan!