That's kind of the point. Modularity allows all these complicated parts to work together as a unified whole, without the creator of any one part needing to know

That's kind of the point. Modularity allows all these complicated parts to work together as a unified whole, without the creator of any one part needing to know exactly how the other part works. It's how high school kids are able to write their own computer programs instead of having to go to college for 12 years. It's what allowed cars to be assembled en masse. It's not a problem, and if it ever is, at least you have a 11,000 pages of text from the creators giving you a complete explanation.