I think you and the person you responded to are talking past each other a little bit. Complexity analysis may well be a poor fit, but still not as poor as a hammer's screw-turning ability. Complexity's poor fit to the real world is a criticism of its use as a programmer's tool, not the concept itself.
Elaborating: Less complexity in each method leads to less overall complexity. And yes, the worst of long methods is that the internal interaction usually leads to more complexity.
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