Yeah. It's pretty dumb when people criticize GM's for the comments they make in the media.
Of course their going to use Wins, ERA, BA ect. Imagine if AA ( or any) GM was like "well he's hitting 120 wRC+ vs lefty pitching in 950 career PA so we thought he should get the start" Or " yeah, his results haven't been quite up to par but his xFIP is 3.33 and we expect better results going forward". Never going to happen because Gm's want to attract fans and if they use advanced stats no one will have a clue wtf their talking about.