If you skip all the subjective stuff and whether "works for shopping" is the goal.. both of your big-O comments have counter examples (check out Coda for 1) as does your energy comment (Eth2 is an effort to switch to Proof of Stake, amongst other upgrades).
That's the typical blockchain reply, suggest yet another ICO out of the ocean of ICOs out there.
> as does your energy comment (Eth2 is an effort to switch to Proof of Stake, amongst other upgrades)
I don't know muuch about Eth2 so I will give you that one.
I've been working in the space for 6 years. I give no craps about the asset, but yes, I think cutting edge cryptography is fascinating.
I tend to agree that the vast majority of "work" in the space is garbage, as are the majority of assets.
Have you ever checked on your own any such "counter example"?