Actually... the account model is much easier to use to get an accurate view of all balances than the UTXO model. As for rollbacks, Bitcoin had one in 2010 (https://en.bitcoin.it/wiki/Value_overflow_incident) and a chain fork in 2013 (https://bitcoin.org/en/alert/2013-03-11-chain-fork) both decided by those who could make the decision... and accepted by a majority of nodes, same as with the ETH hard fork
I'm not so sure about understandability at protocol level, I do believe Ethereum to be straightforward but then again I've followed its progress over the years
I'm not so sure about understandability at protocol level, I do believe Ethereum to be straightforward but then again I've followed its progress over the years