> RISC-V is... fine
Exactly.
> It satisfies my two requirements for an ISA as a hobby CPU designer...
You probably have some unstated requirements as well, such as available toolchains and "vetted well enough to actually be able to run code."
Risc-V now occupies the Schelling point for people who, for whatever reason (rent-seeking and security top the list) want to leave the x86 and Arm ecosystems.
They did explicitly specify:
> 1. Supported in mainline LLVM and GCC.
Which pretty well encapsulates the ecosystem requirements.
Luke is too modest. Something in the region of 5 million chips containing his hobby CPU have shipped since launch on August 8, 2024.