though bitcoin even since 2009 has always been denominated in satoshis. where every raw tx on the blockchain has always been in sats.
which is not easy to break out of while remaining 'backward compatible'

by the time it gets to about 2045 there may then and only then be a case to change the value denomination to sub satoshi levels as the block reward would soon then become
sats:                 year:
4882812.5   2049
2441406.25   2053
1220703.125   2057
610351.5625   2061
76293.94531   2073
9536.743164   2085
596.0464478   2101

however that then plays into  the 'shareable' units (scarcity) debate. of adding more shareable units available at the bottom end