To some extent, I think it depends on the specific sewing machine also. I have seen machines that seem to feed very unevenly, with the feed dogs pushing through much more fabric than the presser foot allows. My Bernina, even though it does not have the accufeed feature (built-in walking foot), seems to feed very evenly. That may be why I've never had much of a problem with uneven feeding of strips or "bending" of long strips from stretched fabric.
So, the two-handed strip feed may work better on some machines than others. It may not all be user-dependent!