In my opinion it's because it has not happened yet. Yes I know about the etherium experiment that has been delayed many times but may be running currently, but the crypto community seem to prefer the proof of work.
They prefer POW because it's actually more secure and decentralized. ETH POS results in a smaller group of people controlling the network, majority of fully validating nodes running on AWS, and introduces massive collusion/attack risks.
ETH POS has many of the bad characteristics current central banks have...
ETH POS has many of the bad characteristics current central banks have...