I've no idea why people recommend that. It doesnt seem necessary.What's your success rate on putting directly into soil420 fastbuds says to put in cup of water and let float for 2 to 3 days in a dark place between 68-77°f.
90-100% success - depending on the viability of the seeds, and getting the moisture and temps right and not planting too deep.
Use your finger nail as a guide for depth.