>"The argument for rollups + data shards (rads henceforth) is usually it’s more secure and decentralized. But this is only part of the story. The real reason rads are the only solution for global scale is scalability — because it’s the only way to do millions of TPS long term. Specifically, I’m going to consider zkRollups, as optimistic rollups have inherent limitations. So, why is this? It comes down to a) technical sustainability, and b) economic sustainability."