they have a yap root you want a dome untill it has a root system not just the tap. the tap root isint the best working it needs to grow the little hairs (forget the name) thats why i say wait until it pokes out a small container or about a week or so.Seedlings have roots from the start, allowing them to take in water. The cotyledons then provide the first initial boost of energy and food supply until the first set of real leaves appear. The dome is crucial for cuttings because there are no roots to absorb water. The high humidity from the dome prevents transpiration from the leaves. Seedlings aren't facing the same shortcomings.