Autoflowers dislike being transplanted because any setback during their short vegetative window reduces final size permanently. Starting them in the final pot avoids this entirely, though it requires more careful watering early on. The autoflower section on https://potentthcseeds.com (https://potentthcseeds.com) explains why growers often see stunted autos after moving them and how to start directly in the finishing container. Photoperiod seeds tolerate transplanting far better, which is one reason beginners are often steered towards them.