[jka]

You have a point, but at the other end of the spectrum, writing precise legal terms can cause problems as well.

If the terms refer specifically to "cookies" and "browsers", it'd be entirely possible that the advertising industry and other players would simply change their own wording to evade the law.

An effective legal claim might be able to find out about and catch up with those kind of tricks; but it'd be partly a game of time, and simply by delaying legal challenges while their operations continue, the ad industry would have achieved their goals.