Now if you have X devs in a team you can end up with up to X*2 copies of same knowledge/assumptions. When any such assumption turns out to be wrong you have to change X*2 places, but that's not a problem. Problem is finding all those copies. When system gets large this task goes from easy to impossible.
But I guess it is an OK rule for tiny teams and tiny software systems.
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Now if you have X devs in a team you can end up with up to X*2 copies of same knowledge/assumptions. When any such assumption turns out to be wrong you have to change X*2 places, but that's not a problem. Problem is finding all those copies. When system gets large this task goes from easy to impossible.
But I guess it is an OK rule for tiny teams and tiny software systems.