1-Every team does this. Pulling an SP in the 1st or 2nd inning is a recipe for disaster. You use 7 RPs for one inning each, then maybe have to use 4 of them the following night, and you have no one left. In addition, there is an argument in favor in favor of leaving an SP in long enough to get his full workout.
2-Every team does this. Just because there is no game to be won, doesn't mean you never have your closer pitch. It had been a week since Chapman had pitched.