> Internalizing that has been difficult for me as an engineer.

I suspect this is because everyone wants to not only feel as part of something but they want to make an important contribution. I venture to guess accountants at Google do not feel they make a difference to search. The culmination of parts is what makes the company whole and all those parts are required.

Its hard to accept you are not as important as you wish you were. Its a great step in the maturation process of one's professional career though.