As tough as sweet potatoes are, I don't doubt you at all. I think one of the considerations is that sweet potatoes need a long hot growing season. Many of us need the head start of starting them early inside. And it is so easy.
Last year, I had a sweet potato slip that was longer than I wanted to plant, thinking the undeveloped root might have trouble supplying that long a slip. So I cut it in half and planted it. I also stuck that top half in the ground. No roots or anything. I did water it when I stuck it in the ground and it set in a little wet for a few days. That top rooted, grew, and produced sweet potates. I never worry about the slips I break off that potato if they don't have roots, but I was a little surprised that that top lived and produced. I do consider sweet potatoes real tough and easy to grow, if you have room and enough warm days.