Yet, managed languages have somewhat brought that back, enabling very large and complex applications with many parts in one image. Windows is programmed using

Yet, managed languages have somewhat brought that back, enabling very large and complex applications with many parts in one image. Windows is programmed using machine-language executables written using an unsafe language, which makes all the difference. That's what necessitates hardware protection. (One single address space still benefits from virtual memory, whose advantages go beyond protection.)