I'm afraid most sports games are like that, having two different engines, one for realistic (quasi)physics-based engine to fully simulate the "process" and simulator which really only simulates results (and not the "process" itself). People just want to quickly do away with part of the games that they are not involved, so to speed things up the simulator is used to "pad" realistic results without actually fully playing out the process.
I actually prefer to have an option of playing everything out with the full gameplay engine, and managed to do this last year with MLB 15:
2430 CPU vs. CPU games
When you compare full-season CPU vs. CPU results against what you typically get with simmmed seasons, you definitely notice the differences. But to the game's credit, it's not THAT wildly different.

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