There are already plenty of other altcoins with differing properties; it remains to be seen if one will fundamentally fix this problem while keeping the benefits or adding its own.
O(n²) does not mean n². Yes, there is a (small) constant factor because not everyone transacts with everyone. If you prefer, make the exponent somewhere between 1 and 2 if you expect sub-linear growth with user base. How is the number of full nodes constant?
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Security, decentralization is no better with 8 billion nodes than some M nodes, not every user needs a node, for sure. So, choose some constant M that satisfies some arbitrary definition of decentralization.
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That's called centralization. A defining feature of a decentralized system is the growth of participating nodes. The world didn't start out with or settle on a fixed number of email servers/systems (even as some, like Gmail, are really large). We're still getting new ones.
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Also, choose some arbitrary constant for the number of people a person will transact with in their lifetimes - not every entity in the world. n^2 is different than a large(?) constant times n.
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The number of people a user transacts with in their lifetime is definitely not a constant. We've seen an explosive growth in that number thanks to (mostly centralized) online payments (and micropayments).
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A = number of nodes needed for decentralization and security. n = number of transactions Space required = O(A*n) = O(n) Number of TXs is n; number of users is not n.
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