The Compromises and Benefits of Ethereum switching to a Proof of Stake network
What are some main risks of Ethereum 2.0?
A main risk of Ethereum 2.0 is that Proof of Stake (PoS) does not work as hoped. Unlike Proof of Work (PoW), PoS has not yet been proven to work at significant scale and its vastly increased complexity compared to PoW creates a much larger surface area for unintended behavior (bugs) and attacks
source
https://coinshares.com/research/compromises-and-benefits-ethereum-proof-of-stake-network