For example, first and foremost reason is that I am
You do not need to say both, for example, and first and foremost. Pick one or the other. Example: For example, one reason that I am... Or: The first and foremost reason that I am... You do not need the word is.
Actually, I have lots of other answers to the question "why APU?".
I agree with Dumi, this sentence is unnecessary and distracting.
Over all, it is a well written essay.