Proof-of-work is hard to beat. Look at all the spam emails we get. I don't understand why it's not consensus, as we all have some computing power at our fingertips.
Discussion
You and #[0] are dominating the daily feed on https://powrelay.xyz
I think there's a worry that it will privilage beefy desktop users over phone users, and then gpu users → fpga enthusiasts → asic enjoyers and so on. But I don't see a problem with that since it'll just cause a market to spin up and pow will be priced competitively.