Earlier quoted context omitted.
It's almost like we shouldn't have tortured a document transfer system until it was able to run full-on applications.
If operating systems had ever provided security strong enough to run untrusted code, we wouldn't have needed to. It's really a failing of operating system security. Even today no operating system provides an application sandbox as strong and versatile as the browser. Platforms have fallen back on walled gardens (app stores) with centralized control of all code execution to compensate for the deficiencies of their sec…
The browser hasn't either. See all the recent intel bugs and how many can be exploited from javascript.