Yes, I meant regions as well. Speed-of-light bounded latency certainly means that serializable ACID transactions are not workable in some situations, but I disa

Yes, I meant regions as well. Speed-of-light bounded latency certainly means that serializable ACID transactions are not workable in some situations, but I disagree with OP that this proves them not viable period, at least at planet-scale as you say. We're indeed pretty lucky as far as transactions are concerned...