the entire denomination scheme of bitcoin is just fixed point integers. it's just a matter of changing the function so it doesn't do half every ~4 years but instead decay the reward smoothly, but still as a fixed point. fixed point simply means that the precision before and after the decimal are fixed, X bits are whole numbers, and Y bits are fractions.

Precision change is very much warranted when the halvings start to imply fractional sat precision. I hope that happens for consistency and for continued usability of the layer 1. But as far as the mining subsidy during halvings, it won't make much difference unless world productivity somehow grows fast enough to more than double every 4 years over the next two centuries.