Congratualations, you managed to derail the main point of my post which was: Faster/more x5 Maelstrom procs > everything else.
And what gives you faster procs you ask? You guessed it - SS and LL, because they're actual melee hits which trigger it, unlike ES. Me mentioning Windfury proc at all was just a bonus in reply to your "ES is one of the harder hitting spells"
For all that I (or any other respectable enh shaman) care, I don't have to use ES even a single time if my x5 MS are proccing like crazy (which is very often the case in end game with BiS gear, which the guide was about btw) and only keep FS up
Now YOU can stay ignorant and nitpick which sections of my post you want to discuss, but the facts will always remain the same, and you should probably know it yourself: Enh is all about those x5 Maelstrom procs. The faster/more you get them, the more dps you do.
I hope you get the point now :)