I guess you're being downvoted because of the swipe at JS, but that's pretty much what's happened yes. Desktop OS vendors dropped the ball on sandboxing and int

I guess you're being downvoted because of the swipe at JS, but that's pretty much what's happened yes. Desktop OS vendors dropped the ball on sandboxing and internet distribution of software so badly that we ended up evolving a document format to do it instead. The advantage being that because it never claimed to be an app platform features could be added almost arbitrarily slowly to ensure they were locked down really tight, and because of a pre-existing social expectation that documents (magazines, newspapers) contain adverts but apps don't. So ad money can fund sandboxing efforts and if it lags five years behind the unsandboxed versions, well, it's not like Microsoft or Apple are doing the work.