I mean, the issues seem pretty obvious, and they aren't 'everything'.
We had some of the best pitching and defense in baseball and finished with 89 wins. This was a pretty good team that had some unexpected struggles at the plate.
They probably need to re-structure their hitting coaching. They need to figure out what went wrong with Guerrero and Kirk (and Manoah). They probably need to acquire another big bat this summer. And they need to hold someone accountable for the pitching decision that was made yesterday, and it doesn't sound like that was Schneider.
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As for Schneider :
Fans are going to complain no matter who the manager is. There are literally dozens of decisions every night for 162 games that fans can micro-analyze and if 29 of 30 decisions in a game make sense but in the 30th decision the manager chooses something with a 26% probability of working over something with a 28% probability of working because he's also trying to manage a clubhouse and get some playing time for a player who has been sitting ... fans at home playing video games will freak out that he's the STUPIDEST MANAGER EVER! and needs to be fired immediately. And it's like this for literally every MLB team.
Generally speaking, what I saw from Schneider was the most sensible managing I've seen from this team in a long time. It's miles better than the Charlie Montoyo insanity, and before that we had Gibbons for ages who was an old-school manager that I liked but who managed like Mr. Burns when it came to understanding things like reverse splits.
Until yesterday, the handling of the pitching staff and defense was consistently spot on. The only real big complaints fans had were that he was playing veteran star players like Chapman/Merrifield too much when they were slumping ... but good luck finding a manager/coach in any sport that doesn't trust his veteran players and give them a lot of rope, because that person doesn't exist.
Schneider's one weakness is that he's still a young manager and on occasion over-managed and galaxy-brained a situation, but he'll surely learn from that. He's one of the best young managers in MLB and I have zero problems bringing him back.