I guarantee you that blockchain tech can solve a real, extremely important problem, though it's only a problem for some people. If you're connected to the money printers, then it's useless to you. Just like if you worked for a company like Enron which was cooking the books, 'honest accounting' would not be a solution for you; 'honest accounting' would be a problem for a company like Enron and everyone who works for Enron.
Proof of Work is highly inefficient and inconvenient. I agree to this.
Cryptocurrency sector is mostly a scam; or at the very least, a kind of casino. I Agree to this; though my understanding is that it has been corrupted by mainstream financial interests; just like Africa is kept corrupt and poor by some of those same interests. Then the plebs basically blame African people for 'choosing this'.
I've worked for some very successful crypto founders who became corrupt. I saw the change happening. The desire to improve things turned into self-sabotage. It was unlike any other company I ever worked for; nothing made sense. Yet I know for a fact that government regulators gave their approval. I witnessed the EU commission give grants to scam projects with nothing behind it, then these same founders got funding again and again after failed projects. It was all announced publicly though it took some time to understand that the projects were scams from the beginning... But like they got money from a government entity and they didn't build anything AT ALL. Then they got more funding on their next project... Weird right?
Proof of Stake is actually highly efficient; it's basically a ledger with dynamic runtime replication ability.
Unless you fully understand the current mechanism of how money is created globally; including the Eurodollar system and how stablecoins, derivatives and other financial constructs could be used for legal counterfeiting, you should not speak about the utility of blockchain.