I don't think combining decentralization and scaling is that difficult achieve for DPoS chains. The problem is more of a political than technical nature. The distribution of stake is key. If the distribution of stake is not too concentrated and if the number of block producers (and nodes validating transactions) is sufficient, then adequate security can be attained by a DPoS chain. In fact, Ethereum is striving to become a DPoS chain. But it will take time for ETH to transition to PoS from PoW. Ethereum cannot have real use except as a platform for mostly dubious ICOs as a PoW platform until that. 21 block producers sounds quite small. In that sense, the Graphene-based Larimer-designed DPoS chains are not nearly as safe as the typical PoW chain. If there were 210 block producers spread across the globe under tens of different jurisdictions, then EOS, Steem and Bitshares could be safer.
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