As has been the case far too often since Aaron Boone's hiring after the 2017 season, the Yankees displayed the difference between losing and getting obliterated in their biggest series of the season. With the lowest of bars to clear - a single win in four tries at home against the Red Sox, losers of three straight entering the series, the Yankees have, at best, delayed that lone victory to the final game of the set.
At worst? Well ... you watched, right? Unless you didn't. It's fine if you didn't.
A manager can only marginally affect a baseball team's ability to win a given baseball game on a given day in the modern environment.