There's a difference between keeping players out there who are hurt, and keeping players out there who are injured. In the Sturt at Chapman examples it looks very much like we're keeping injured players out there, which is pretty questionable even if you're chasing a premiership, but pretty bloody maddening when they are young guys playing in a developing side (as JLo put it).
Perhaps it's not the most salient point, but if I was Chapman's parents watching on the weekend I might have been inclined to call the coaching / fitness staff and give them an earful (my wife would have correctly persuaded me otherwise).