That is one purpose of the BIP, to force people to learn that Bitcoin is not actually divisible and we cannot add more decimals places because it uses whole integers.
Its currently hardcodes to simulate 8 decimal places using integers. Wouldnt be hard to increase that to 11 or 16.
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What is "hardcoded" is a limit of 2.1 quadrillion base units.
I actually disagree because there is no actual decimal place. It’s just an integer. Which means making more granularity in a soft fork is actually a lot messier than it seems.