PoS security is weaker than PoW, that's a fact. See https://bitcoin.stackexchange.com/questions/70807/how-does-proof-of-stake-prevents-dishonest-behaviour-compa

PoS security is weaker than PoW, that's a fact. See https://bitcoin.stackexchange.com/questions/70807/how-does-proof-of-stake-prevents-dishonest-behaviour-compared-to-pow https://bitcoin.stackexchange.com/questions/70807/how-does-p... But is it stronger enough to still be 99% as useful? I don't know, these are all experiments.