Polkadot: Why Not Upgrade Ethereum?

We could have gone towards the keep as much as you can from Ethereum and kind of do the minimal set of changes in order to shard it. If we were doing that, it seems to me that it would be unlikely for us to really put forward anything that would become successful. The alternative was simply to say, right, well, let's start afresh and build something that we think is not just the sharded version ofthereum. And that's that was just by far the obvious correct decision.