The sentence is not complete & lacks context. The author is referring to his statement earlier "...Flux as of today splits the store/action relationship matrix on the wrong axis: You can easily see all the actions that affect one part of your state. But it's hard to figure out all the state one action affects." The author asks why, and Facebook's "reasoning" is the next paragraph, "Letting the stores update themselves..." Reasoning means the logical, thinking process that guides a decision.
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