> Surely the right thing to do is to write your systems in such a way that you can pull out (say) a file-system explorer written in flex and replace it with one

> Surely the right thing to do is to write your systems in such a way that you can pull out (say) a file-system explorer written in flex and replace it with one written in JS in as easy a manner as possible. Especially if it was indeed as clear at the time that Flex was doomed as the author claims. Hindsight is 20/20 - "the history test" is BS without the benefit of it.