He's won 74 games or more every year he's been in charge - only the Cardinals and Yankees have accomplished that during his tenure. That's amazing if you consider the difference in resources.
Yet he's never built a team that could succeed in the playoffs, and this year he tried something completely new by trading one of his chips before the offseason and that failed miserably.
I'm not sure what he does next - probably trades Donaldson and maybe Smardjzia and rebuilds something - I never know. Or maybe he just steps down out of frustration.