To be fair I’m not a huge fan of pure proof of stake because it makes validation more difficult because you have to have code for slashing somebody’s stake if they are malicious or bad and a malicious entity could just buy up a bunch of your tokens and tank them. Admittedly, not a lot of people would do so, but I could totally see a government buying up a bunch of tokens on a network and purposely crashing the network in order to rid themselves of a nuisance and calling it justified. Proof of work makes that much more difficult. Still doable for certain, but much, much more difficult.