Stay classy noodle.
I think you need to chill.
It wasn't Barcelona we were playing today noodle it was QPR. The worst team in the league. SAF thought we had enough quality to see them off, he put players on the bench, it didn't work, he brought them on, we won. Job done, 3 points, SAF is doing his job. End of story.
Had we not won the game, then you could question him. Why he didn't react. But he rested players in a game that on paper, you can rest players in and it didn't work out. He changed it round with plenty of time left, and we turned the result around. Something it might not have even come to in the first place. Simples.
Yes he could have played the players from the start, but we didn't need to. We just showed that we didn't need to. We are more than capable of picking up the win without doing so. That's what subs are for.