Doesn't changing it once imply that it might be changed again? I don't want to spend the rest of my life listening to people arguing back and forth about whether it's time to redefine the basis again---that doesn't seem very clean to me.
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Only if there's a consensus change to make the basic unit in the code even more divisible?
If Bitcoin is successful, that will have to happen eventually. There's only 300,000 sats per person in the world (less than that if we assume some BTC have been lost). People have already tried to address that perceived insufficiency through things like millisats. When we fix it at the consensus layer, which will practically require a hard fork, it would be nice to address the problem forever by allowing arbitrary precision, e.g. allowing output amounts to be defined as a fraction of MAX_MONEY. If that happens, the idea of base units goes away
If you assume that we'll never add inflation to Bitcoin, then the monetary constant is the supply, not the fraction of it that we currently transact in.