I am reluctant to admit this for fear of jinxing myself, but I have never had a problem with damping off. I wonder if keeping them a litter dryer helps, which I can do with the top watering. I don't know why, but I always have really soggy soil at the bottom of the cup before it wicks up high enough to get to the tiny seedlings at the top. And I used to think preventing damping off was part of the reason people didn't want to water from the top.
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