It just feels half-done. This seems to be a loose end left hanging because this is all rooted in theory and not in practice. In theory it doesn't matter if you

It just feels half-done. This seems to be a loose end left hanging because this is all rooted in theory and not in practice. In theory it doesn't matter if you have to polyfill half the builtin feature with JS because otherwise it doesn't work. In practice, yes it matters.