Well, a bigger problem in terms of transaction count is that proof-of-work systems are designed in such a way as to put a hard limit on the number of processabl

Well, a bigger problem in terms of transaction count is that proof-of-work systems are designed in such a way as to put a hard limit on the number of processable transactions that's nowhere near the world's needs, and moreover, they expend multiple orders of magnitude more energy to do it.