Hard to know which piece of misinformation to respond to.
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).
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).