Using smaller fragments of a bitcoin doesn’t solve the problems of a fixed money supply. While an arbitrary increase in coins is not desirable, a fixed-rate increase may well be (see arguments of eg Scott Sumner in favour of fixed growth in nominal GDP).
(Not to mention that you could do the exact same thing with any currency—there used to be 1⁄4 pennies and so on).
Using smaller fragments of a bitcoin doesn’t solve the problems of a fixed money supply. While an arbitrary increase in coins is not desirable, a fixed-rate increase may well be (see arguments of eg Scott Sumner in favour of fixed growth in nominal GDP).
(Not to mention that you could do the exact same thing with any currency—there used to be 1⁄4 pennies and so on).