Also the attack speed is great because it allows you to get more hits off with your E spell, so you truly incinerate other heroes, and actually end up splashing more because you get more than 2X's the attacks off.

Well in response to your post, the point of this build is to DPS and be able to solo other heroes as well. This build gives you lots of AD while also providing enough AP for your heal and nuke to still be very useful. As far as the bonus damage on your E spell, with the AD you sacrifice A LITTLE BIT of the splash damage in exchange for doing large amounts of damage to your actual target. The build gives enough AP so the splash is still good. What you are suggesting if more AP which makes your nuke better and your heal better and you E spell does less damage but splashes a bit more. This is really about would you rather be more of a support or more of a DPS? I find that this build finds a very good medium which offers quite a bit of Attack Damage and still gives you plenty of AP to heal and nuke-poke. I really think that you are much more useful when you are able to really do large amounts of damage and solo other heroes as well as use your heal and ult as support.

without ap your heal will do like nothing on kayle, i mean the ultimate is nice but her heal cant save anyone for long and her spell is i think better with ap when it splashes and attack speed i just cant see her doing good with because she has no skills that help with that.
sry -1