Crypto bros say it's worth tolerating 100x cost (technical cost, energy wasted, etc) and 100x more complexity (as one example, we are 7 years in and ETH is about to be 'reborn' the right way, with the transition to proof of stake) in exchange for what?

For a small but key piece of the 'decentralized' Web3 infrastructure to be controlled by a random stranger due to random events?

Welcome to the future, folks!