Earlier quoted context omitted.
Imagine you woke up one day set on the intention of digging a tunnel to China in your backyard by only using cutlery. Would throwing more people in the hole armed with spoons fix the inherent issues with your project? The reason why there are lots of experts criticizing the current implementations and crypto concepts is because it's vastly easier to realize the flaws in one's idea than coming up with a new proposal.…
In the digging example, the goal is to complete the tunnel. If the tunnel is not completed, the project would be a failure. You say that PoW works and makes cryptocurrency doable, yet you conclude that it is a failure. But you don't define what the goal of it is. What specific goal would you want crypto to achieve to falsify your belief that it is a failure?
Can you say the same for cryptocurrency? Where does the value of a cryptocurrency come from? The answer is "from its scarcity", but scarcity itself doesn't make something valuable. What makes Bitcoin valuable is its tradeability with real world currencies, such as the Euro and the Dollar, and the fact that people want to spend them to get Bitcoin. Bitcoin is not a real currency, is just a very complicated bank with extra steps, based on an asset whose value basically depends by the biggest Ponzi scheme ever known to man.