Hand piecing is just fine. The reason you back stitch is if the thread should break it will only come apart 2 or 3 threads. I was taught never to start at the beginning of a seam or at the very end because this is the weakest point. I use a single thread. Never had any problems with thread breaking. Fabric will wear out before that will happen. And, I double dare you to rip out a seam. You must remember, after the top is quilted, there is no stress or pulling on your seams. So machine, or hand piecing...do what you prefer and worry not!
Donna