It’s the decimal points. I think it’s eight places (hence “bit” in Bitcoin.). That hasn’t changed since day 1. Although many people don’t understand how divisible it is.
Well then that would be because math is racist. But I will concede if BTC does somehow gain in popularity it is going to confuse a lot of people. Burger, fries and a coke - that'll be 0.0001165 BTC please.