There'd be less time devoted to Kellie's development.
I'd be focusing on when she had to pee instead of how much tummy time she'd had that day.
As I write these points, I realize they don't carry the full weight of my Mommy's wisdom, so they seem flimsy. But I've given it thought and decided that part-time ECing is best for us and our situation. Since her poops are few and far between (and very obvious in their coming), she'll be pooping on the potty. But since she was peeing two or three times an hour, she'll use her diaper to pee. This way, the benefits I'd listed previously are still enjoyed. And I spend less time running with a naked child to the potty. (In an eight hour period, we made this run at least sixteen times. Excessive. I know. And she didn't pee each time. Sometimes, it was just her making faces. And me being paranoid.)
Yet again, I change plans. :) Don't you love how predictable my unpredictability is??