they hatch hungry!!!
Same goes for the containers.
Seedlings are way more vulnerable than grown plants to pests. Clones are most vulnerable to fungal, bacterial, and viral infection. You can't tell for sure if your soil carries any of those. For example, I bought a bag of cow manure at Walmat and ended up with a lovely mushroom garden. That was lucky... mushrooms dont' harm your plants... but some other fungus can!