With the first RVA23 boards shipping this month, I find it a mistake to still focus on legacy ISAs like x86 or ARM rather than what will be dominant by the time AV2 is deployed.
riscv is primarily used in microcontroller or peripheral cores on an soc. It'll be a while yet until it is competitive on application cores that applications people run on such that we adopt it in mass. Arm and x86 are also not legacy or going away. The choice to focus on them is rational at this time.
What is your criteria to measure this by and over what time scale? In 5 years, I have doubts we will see even 5% penetration of riscv on platforms which end user software runs (outside of China). I wish I could be more optimistic, but after paying attention to the standards process due many years and seeing the landscape evolve, I've become pesemistic on the matter. Even after hardware is competitive, software support will continue to lag. This culminates in security, performance and power challenges that would regress user experience compared to arm and limit adoption by device makers.
