Great write up on the consensus challenges for POS. POW has proven to work at scale on various cryptocurrencies. POS still seems in it's academic infancy as far as moving forward into the Proof of Stake less energy utilization world of cryptocurrency and blockchain.
An artificial intelligence and big data inspired blockchain, IoT, Lorawan and ICT architect and business transformation strategist designing and building decentralized products and platforms with ethereum, stellar, cardano, tensorflow, dialogflow, kafka, spark and more. Capturing insights for a more decentralized happy universe.