Jeffers belonged on the same stud-tier as Ryan and Buxton even before the season started. The bar is just set differently for catchers.
But as for your basic point, I've had the same concerns too, for a long while now. I could quibble in a few cases, such as Ober panning out as "just average" after being a 12th round draft pick, as a development "hit." But a low-revenue team like the Twins needs to make the flat-out misses on high draft picks really low, and they don't.