Assuming increased attack speed effects how quickly you refresh the AoE, it gives you the ability to pop a spender (like a heal or protection) and continue to sustain Blade Storm. It could also allow you to spam certain cheap, low cooldown spenders like tail kick and of course, dashing strike. In all honesty though the example of Way of 100% fists obsidian was just an example... I haven't really thought this build through yet because right now I'm just absorbing the discussion were having.
The whole "crippling wave slows on every hit in beta" thing annoys me because that's not the way it's written in the calculator. So I'm personally choosing not to believe that is anything more than testing until I see it on the website. It seems slightly OP but if they give it to us I'll take it.