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It is actually sort of strange how compartmentalized the living cell is.

I guess there is some type of redundancy that comes from compartmentalization that is evolutionarily beneficial.

There is a theory "endosymbiotic hypothesis" that mitochondria were wholesale absorbed bacteria into our DNA line. Which I think is pretty wild, and explains how neatly they're compartmentalized.

No doubt, and separate organs with (sometimes rough, sometimes very clear) separate functions are also a thing, so evolution seems to favor compartmentalization for more complex systems. But that does not mean that there are not complex overarching interactions that make full understanding really hard. The sort of interactions you would stay away from when designing a computer, not because it would not work, but because it would make design, debugging, and iteration upon your system prohibitively hard.

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