I can see it from both sides.
His number one responsibility is to earn as much points as possible from each match we play, so he feels he has to play the strongest team possible at all times as long as we have something to play for. If we were still mid-table cloggers, this probably wouldn't be so much of an issue.
On the other hand, he's spent the last couple of seasons filling the squad with absolute dross (Jeffrey Monakana, Josh Parker, Alan Tate, Wes Burns, etc) on loan that he then feels duty bound to give them match time ahead of our own young players. Scott Wright has been knocking on the door for a couple of seasons. If he's going to bring in someone on loan that keeps him out of the matchday squad, at least put him on loan to a Championship team for a season to get some competitive first team football under his belt.