Fair or not, as an OF coach Beyeler bears some degree of responsibility for Ramirez' performance in LF. Just wild, irresponsible speculation on my part, but I wonder if Beyeler just didn't fit well with older, more established players like Ramirez (and Cespedes too from what I recall) who maybe come from a different cultural background. A former minor league coach who never played in MLB, and never played in the OF, I could see how a guy fitting that profile might not get as much...I don't know, respect from veteran players. Amaro at least played OF as a professional player, and played in MLB for several years. Plus, he served at one of the highest levels in the game, and is clearly a personable and likable guy who can manage egos, because I can't think of another way he could have stuck around so long as a GM. Maybe he was like Wendall Kim - a very solid guy who kind of Peter Principled his way to the job that was just a little over his head.
The only things that make me slightly nervous are that Amaro hasn't really been an on-field coach in the clubhouse, I don't think. That seems like a pretty different role than the front office, but 1B coach is such a low-level role that I doubt he could be that bad at it. This does make me continue to think that we are going to see some big, splashy moves from Dombrowski this winter - even the hiring of the 1B coach is pretty high-profile! Perhaps the least important member of the coaching staff. Hold on to your butts.