> Companies have been pouring resources into optimizing ARM CPUs for years now Yes, companies (Apple especially, but also Samsung and Qualcom) have been making

> Companies have been pouring resources into optimizing ARM CPUs for years now Yes, companies (Apple especially, but also Samsung and Qualcom) have been making optimized ARM CPUs, but those designs remain within those companies. Very similar optimizations could be made on a RISC-V implementation and AMD has proven that they have the ability to make design optimizations.