Yah, KF is about the only guy I know who does this idiotic thing. It keeps backups from getting vital game experience, and it unnecessarily exposes your top guys to injury. And yes, what KF allowed to happen to Adam Robinson is unforgivable. Robinson, an outstanding freshman RB, was still in the game late when Iowa was leading MSU something like 35-0, and Robinson suffered a concussion. The aftermath of the concussion led to some bad decisions on Adam's part, and Robinson's career ended abruptly after his brilliant freshman season. KF sure as hell didn't learn that from Hayden Fry. In fact, I think KF, consciously our unconsiously, has spent his entire career making sure he doesn't do anything like Fry did, with the exception of the swarm. And that has prevented KF's teams from being as successful as they otherwise would have been.
KF is an odd duck in many ways, and refusing to sub in blowouts and refusing to keep playing football with the backups is one glaring example. Instead, he keeps the starters in and runs out the clock. Weird, and wrong.