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A 4 cylinder engine, while not as powerful as an 8 cylinder, will have much less problems because it's not as complex. The human mind is the same.
The more nonsense you cram in there and worry about, the more neuroses, anxiety, and depression you'll have.
I don't know if I've ever known an extremely intelligent person who isn't fraught with these ailments, as well as a lack of common sense.
Everything's a trade off.