Because they aren't. Lifesteal means taking something else's life force for your own. WAR does not do that, and never has.
You can dislike the way WAR works all you want, but as long as you keep insisting it's somehow "lifesteal" this whole discussion isn't likely to go much of anywhere.
Though I'm not sure it even matters, recent changes to multiple classes indicate that "braindead" is the skill level classes are designed for now. Anything that is "creative" in any way, shape, or form, would likely be considered "too hard". I mean, apparently they thought ShB WAR was "too hard", and even EW WAR needed to be "streamlined" in 6.1 because still too complicated, so yeah...