I understand that. But you are absolutely wrong that additional decimal places increase supply. 1 Bitcoin equals 1.0 Bitcoin. Slicing the pizza in half again doesn't make the pizza any larger. A decimal precision increase is not off the table for the base layer. In fact, I would think it would naturally increase with little to no pushback if the time came.

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Bitcoin doesn't have decimals, it has sats. "Whole coins" are an abstraction, a Bitcoin is 100M base units, sats. You can't add abstracted decimal places without a supply increase of the base unit, which would break every piece of Bitcoin software ever created... it's not going to happen. 2.1q sats -> 21q usats or whatever is a 10x supply increase. The hardest fork imaginable.
Justin, you have seen on chain transactions right? There are obviously decimals involved. Not trying to pile on here but the idea of a whole bitcoin being a pure abstraction is not correct. Because there _are_ decimals this is why dividing it by another order of magnitude would not result in supply increase.
A fraction of a sat doesn't increase how big a Bitcoin is. If I take a penny and cut it in half it doesn't increase the amount of cents in a dollar.