A few weeks ago, my colleague used this space to discuss the second and third papers showing teams had turned skin cells directly into neurons, noting that this replication of research results is essential to verifying the initial breakthrough while refining and improving it. She noted that only after much replication and refinement would she or anyone else want the resulting cells for therapy.
This is the way things often go in science: One group announces a breakthrough. Yah! Then for the next several years, scientists all over the world replicate and improve on that breakthrough until it's finally believable and widely useful.

To people outside science who read about the initial breakthrough, this may look a lot like scientists twiddling their thumbs, sitting on new therapies. But really, do you want a therapy based on a breakthrough that may or may not be real? Right, neither do I.