Ethereum faces pressing questions over its direction as a rejigged user experience saps activity and fees, stoking uncertainty about whether the blockchain will continue to underpin commerce in crypto.Critics point to a growing reliance on so-called Layer-2 blockchains, built on top of Ethereum to improve otherwise clunky and costly transactions. Layer-2 operators like Arbitrum and Optimism have reaped the rewards. Since March, Layer-2 transactions are up 430%, while fees collected by Ethereum h...