One argument I can think of is that PoS gives the power over the currency to the wealthiest users. On the other hand, any financial system is controlled pretty

One argument I can think of is that PoS gives the power over the currency to the wealthiest users. On the other hand, any financial system is controlled pretty much by the wealthiest, even (and especially) Bitcoin, as you can buy more computing power with your wealth. Not to mention pump and dump schemes you have access to with more wealth. So yea, PoS is the way to go, at least wrecking the environment is not incentivized as much.