> It makes me sad that we are likely not going to see any new fundamental design rethink for security's sake in mainstream operating systems. It is cost prohibi

> It makes me sad that we are likely not going to see any new fundamental design rethink for security's sake in mainstream operating systems. It is cost prohibitive at this point to do something that gets security right for the world of 2022 and yet not break all the apps which would never be rewritten! I don't think that's the case though. Microsoft overhauled the entire security post of windows during Vista. It wasn't a good OS when it came out, but Windows is much better for it. But yes, if you're going to start from the ground up, you're going to lose a bunch of functionality. Not only due to the nature of rewrites, but also because of "what new limitations does the security model imply"?