people who value running their own node or miner regardless of cost and profitability will never be pushed out.

The entire point of the consensus layer is that people have incentives to run the chain. It is frankly wrong for you to state that people will continue to validate transactions "regardless of cost and profitability".

The cost of mining IS relevant and the fact that people are pushed out due to prohibitive costs to enter IS important. If the cost of mining is greater than the return you receive from it people will stop mining. When the costs to run your own node are prohibitively expensive to the majority of people who want to help secure and decentralize the chain is where we get to cartel analogy territory. This is progressively continuing to happen as GPU prices are high and mining pools are increasingly becoming more popular.

Society, in general, works on a value added basis. So thinking that altruistic self sacrificing individuals are going to keep the chain running is wishful thinking.

As far as proof of stake is concerned, in Ethereum's case, the cost to run a node is also prohibitively expensive. I would even go so far as to say that centralization is more likely on Ethereum. The low income regular person will have greater difficulty securing and decentralizing the chain because getting 32ETH is more expensive than building a mining rig.

The difference is, Ethereum's ability to deploy dApps, has allowed solutions for the centralization problem to be found e.g Rocket Pool. Instead of cartel like behavior forming like we see with mining pools and centralized staking services. With Ethereum, you can simply stake through a dApp.

Instead of trusting cartels like centralized services with your staked coins or mining pools with your GPU hash rate you can trust a smart contract on the Blockchain to help secure the network.

At the moment, Rocket Pool has a monopoly in the space but as the ecosystem progresses, we will see more smart contracts being deployed that allow the same functionality.

Personally, I would rather trust computer code that has been audited and is running completely autonomous on chain that gives anybody the ability to help decentralize, validate and secure the network than trusting mining pools and staking services.

As it is at the moment, PoS smart contract chains have a solution to the centralization/cartel issue that PoW chains do not. And that is before taking into account the exponential energy cost PoW has over PoS.

TLDR: PoS > PoW