You should read through the RISCV mailing list archives (https://lists.riscv.org/lists/ https://lists.riscv.org/lists/) for discussions on these topics, and con

You should read through the RISCV mailing list archives (https://lists.riscv.org/lists/ https://lists.riscv.org/lists/) for discussions on these topics, and contribute your own thoughts if they haven't been covered. The ISA-dev list should be the most relevant. They have thought very carefully about these things and I'm sure they'd appreciate additional feedback on the topic.