You're conflating so many different factors here: openness of architecture, diversity of design / manufacturing, market needs in different sectors etc - all of

You're conflating so many different factors here: openness of architecture, diversity of design / manufacturing, market needs in different sectors etc - all of which influence what features are built into CPUs / SoCs. There seems to be a bit of a consistent thread running through lots of discussions that RISC-V because its 'open' magically solves all sorts of problems - it does have some advantages - but it doesn't solve these issues any more than Arm does (and Arm already has massive diversity of supply and billions of CPUs shipped without ME type issues).