No you can't. Adding decimals in Bitcoin is a supply increase, a change in the base unit, not going to happen. msats in Lightning aren't resolvable on chain, they're shitcoins used for internal accounting/rounding... they aren't units of actual Bitcoin. You really don't know what you don't know...

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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.