Joe Girardi is out as Yankee's Manager. He had a 910-710 record and the Yankees won a World Series under him (or despite him being the manager). 10 years with the Yankees and he didn't have a single losing season.
BLUF...Girardi is an arrogant asshole, who refused to give into analytics.
Simply put, talent wins. The manager is there to not and screw things up. Girardi is on par with Ausmus, in that they do some of the stupidest things as a manager. There are at least 15-20 MLB caliber managers who would have done more with the Yankees during Girardi's tenure, then what Girardi did.
20-game winners need run support, or they don't win 20 games. Just ask Rick Porcello. Managers don't win, or win in the playoffs, without talent. Citing a starting pitcher's win-loss record his meaningless. Citing a manager's win-loss record is also meaningless. Even their playoff records can be suspect.
Money can buy you talent. For smaller market teams (see Pirates, Royals, etc) strong analytics gives you bang for the buck. Moneyball was all about analytics. When "old school" managers get fired, like Dusty Baker, it wasn't that their teams didn't win, it was that they didn't met expectations.