>Software isolated processes are now basically impossible to do. I don't think that's the case at all. To my understanding, software has always been capable of

>Software isolated processes are now basically impossible to do. I don't think that's the case at all. To my understanding, software has always been capable of doing this just fine, but at a performance cost. So the mechanism was ported to hardware. Optimized implementations have proven to contain security issues. It's not that the security problems are unsolvable, it's that you can't just patch a broken CPU in the wild. So we fall back to software implementations again, resulting in an overall perform decrease, but with the more correct security.