Well we can still enable it if we need it
"In conjunction with the change, we will need a command line switch and enterprise policy to revert to the older behavior for testing and legacy applications."
"In conjunction with the change, we will need a command line switch and enterprise policy to revert to the older behavior for testing and legacy applications."
Is an about:config switch not being considered? If so I'd imagine the thinking might be "too easy to social engineer round this".