Earlier quoted context omitted.
Wasteful by what standard? Right now each day it consumes ~$1m worth of electricity in order to protect ~$1.5 billion of new payments. Economically, this "electricity safety fee" works out to less than a tenth of a percent.
Wasteful as in we can do better. Did you see the link in my comment? One of the authors of that paper is actually a Turing award winner. Ultimately we've reached a point where there are more efficient alternatives to having hundreds of people computing billions of hashes to reach consensus. To put this in perspective imagine a group of people sorting by randomly permuting and checking if it works, while stubbornly re…
I suspect people underestimate the game theoretic consequences of stake systems like Algorand as compared to PoW. (For example, the dynamics of contentious forks may look quite different.) I don't know which is better! But those types of consequences are likely much larger (for better or worse) than the electricity savings.