Did you watch baseball in the 1970's and 1980's????
If so, Baker would be using Chapman like Gossage, Sutter, Lee Smith, Sparky Lyle.... look at those innings.
Look to the stars
As soon as Baker started using Chapman in the highest leveraged situation in the 7th-9th innings, there would be screaming about Chapman being demoted. The good free agent bullpen arms wouldn't want to come here because Dusty doesn't set roles for them. Think about it, Chapman pitches to the 3-4-5 batters in the 8th and Simon pitches to 6-7-8 hitters in the 9th...makes sense, but Chapman is going to be upset, his agent will be upset, Simon might put too much pressure on himself, articles will be written, questions will be asked. Dusty goes from being a players' manager to one who upsets his players.
Dusty's not going to be the man to break the mold...who is? I have no idea. It's more of a CYA move to go by the book and point out that the pitcher just didn't perform when the opportunity was provided than to write a new book. Same thing with an NFL head coach who punts in the 4th quarter of a 21 point game...why...so he doesn't have to answer questions and he can point out that his team's biggest loss was ONLY 21. CYA moments...sports are full of them.
I want a person at the end of the game that strikes fear into the hearts of the hitters, and that person is Aroldis Chapman. Will he get CHEAP saves? OF COURSE. But, the opponent's and more importantly the OPPONENTS managers, know they are managing an eight inning game with Chapman at the back of the pen. The Yankees have had that luxury for roughly fifteen years. They have the best reliever in the history of the game. It has worked for them.
Once Bitten, Twice Shy, babe.