Not sure I understand - why does the monetary supply need to increase for it to be sound money? The point is it’s finite, yet divisible. That’s the beauty of it. Which means, the entire world gets repriced into Satoshis. Which is already happening with me as I live in a bitcoin standard. Everything around me gets cheaper - houses to groceries - when measured in my unit of account. Everything around anyone on a fiat standard gets more expensive - due to increasing number of units I.e. inflation.