I agree. I don't know nearly enough about it all to be able to think of any, as well. I just know open, decentralized, trustless, permissionless, anonymous cons

I agree. I don't know nearly enough about it all to be able to think of any, as well. I just know open, decentralized, trustless, permissionless, anonymous consensus in global peer-to-peer networks is a very difficult problem that people have been wracking their brains thinking about for decades. BitTorrent, Bitcoin, and Ethereum made some of the biggest breakthroughs, there. It seems like everything might be a variation of one of two possible categories: economic game theory (Proof of Stake), or proof of committal of scarce, fungible physical resources. Everything else I can think of just seems like it'd be some form of centralization/oligarchy. But who knows? (Proof of Stake is sometimes accused of being oligarchical, too, but I think it's still kind of the lesser of all evils, probably.)