But that requirement is the only thing that keeps one browser engine from being able to run FAR ahead and take over the standards process.
Without that requirement, PNaCL would be the standard not WebAssembly, without that requirement ShadowDOM would be Chrome's version and not the version that most browsers are implementing now and which most people agree is better.
It's not just a philosophical goal, but one that has time and time again found issues with proposed standards and prevented them from being included.
It may keep some things out of the standards which should be in it, but it also keeps a LOT of mistakes out as well.
Without that requirement, PNaCL would be the standard not WebAssembly, without that requirement ShadowDOM would be Chrome's version and not the version that most browsers are implementing now and which most people agree is better.
It's not just a philosophical goal, but one that has time and time again found issues with proposed standards and prevented them from being included.
It may keep some things out of the standards which should be in it, but it also keeps a LOT of mistakes out as well.