While this is generally true, I think there's a reason Dusty Baker has never won a World Series despite being at the helm of a great many talented teams.
It's not just that he hasn't won, it's that 16 of his 21 postseason wins as manager were in 2002-03. Outside of those two seasons he's 5-17.
Someone here compared it to the Caps hiring Trotz when his ceiling has been the same as theirs. Pretty spot on assessment.