With PoS, the more coins you hold, the more power you have over the network. Now think of the huge exchanges such as Coinbase and Binance — think about how much power they'd have. Bitcoin with PoS is simply a disaster.
Can't argue with the many similar posts that POS is not an option for BTC. While other coins have this proof-of-stake mechanism BTC is simply too valuable to engage in such without being detrimental to the rest of the holders.
Remember, BTC is all about decentralisation and moving away from the 'one man' monopoly.
Lets not pretend like Bitcoin is not " the one man monopoly" as you put it. If you have the most fiat you can buythe MOST Bitcoin. if you have the largest Bitcoin mining operation you generate the most Bitcoin in rewards. This is the way of the world! No amount of decentralization will change that. Bitcoin cannot change the dynamic of humanity or our society. The one thing we can change is the mechanism the value Bitcoin holds is powered by. Is it powered by SLOW environmentally unsustainable POW core or a environmentally sustainable FASTER POS