If you're anti-KVO, why? Let's set aside performance (which is improving) and the single-method-name. Interested in architecture gotchas.
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The observer pattern, used without care, encourages more un-tree-like control-flow / data-flow graphs.
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My hypothesis is that KVO's design decisions exacerbates the problems more than notification center.
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I think that's true, but on a tactical (not fundamental) level: notifications are a more explicit API surface + invocation.