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So why do so many prefer the old protocol with the old problems?
People don't care about protocols; they care whether a product meets their needs. And the "old protocol with the old problems" does that well enough across the board, including user experience, network size, moderation, etc.

PS: "Decentralized" is not a need; it's just a means to an end, and it doesn't necessarily achieve that end. So people don't care about decentralization itself; they care about what it gives them. In the case of bitcoin, that's censorship resistance.