Why? It'll still run fine.

Just like Debian still runs on original x86-64-v1 from 1999, not x86-64-v3 (needs AVX2,FMA, BMI1, BMI2, LZCNT) or even x86-64-v3 (needs AVX-512).

Similarly, Debian for arm64 still requires only ARMv8.0-A from 2011 not even ARMv8.2-A (everything from A75/A55 to A78/N1/V1) let alone ARMv9-A (A710, A510, X2 and on).

Why would they do in the RISC-V world what they totally haven't done in amd64 or arm64?