Proof-of-Stake is indeed a good thing, and a worthy focus of the article. From the article we read " the long-term hope is that apps built from them will eventually make Ethereum the ultimate cloud-computing platform. " Ethereum does not claim to be a computing platform in the same way that AWS is; it's for low-complexity business logic only. I think it's misleading to use "ultimate cloud-computing platform" to descr…
Most PoS systems I’ve seen basically reward the oldest money holders with the right to stamp new transactions. This reduces the cost, but is extremely centralizing, bordering on neo-feudal.
The cynic in me also notes that developers of these chains are regularly the oldest money, making their motivations suspect at best.