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Exactly, and if you really want EC and Auto ISO, why not just shoot in A or TV mode?
Because it makes sense?
It's one of those things that just doesn't make sense to exclude arbitrarily, especially when Canon enables it on their top-end camera and other companies have no problem with it.
Here's why I want it: I want to control aperture for DOF and sharpness, and I want to control shutter speed to isolate or introduce subject movement, but I want the camera to adjust the ISO speed according to it's metering- except that the meter is 'wrong', or because I want to expose to the right, etc. Not having this option forces me to slow down arbitrarily.