And in the outdoors even newly sprouted seedlings don't usually have moist soil 24/7. I water my plants, whether seedlings or fully mature, when the top inch of soil is dry. I stick my finger in one inch deep and if it is wet I wait until tomorrow and check again. If you plant your seeds about 1/2 inch deep it will reach the "permamoist" zone in plenty of time assuming you don't have temps in the 90s with desert-like humidity. So far I have never had any problem with root rot or drying out. The root can grow 1/2 inch within a few hours easily. If it stays continuously moist at the top of the soil you are asking for problems, even with newly-planted seeds. If you olet it dry out the way it would in nature you won't have much problem with damping off at all. In fact why is it called damping off? Because your soil is too damp.