alt Hacker NewsThe exact same mistakes were made in ARM6. RISC-Y biggest competitor is mature architecture ecosystems and variants of itself.
https://en.wikipedia.org/wiki/Second-system_effect
Even most ARM software compilers still cripple the advanced vendor specific asic features simply for stability mitigation. ARM 8/9 was actually a much leaner design. Cheers =3
What mistakes?
No one is ever going to design an ISA that is complete and finished forever on Day #1. There are always going to be new data types and new algorithms to support e.g. the current rush to add "AI" support to all ISAs (NPUs, TPUs, whatever you want to call them).
Arm has ARMv9-A following on from ARMv8-A, and they are already up to Armv9.7-A in addition to as many ARMv8-A enhancements.
Intel/AMD have all kinds of add-ons to x86_64, and not even linear e.g. the here now gone now AVX512. Finally here to stay (presumably) in x86-64-v4. And there is already APX and AVX10 to add to that.