I agree with your broader point that we seem stuck with old shells and no contenders seems in a position to replace them. However some are certainly trying, lik

I agree with your broader point that we seem stuck with old shells and no contenders seems in a position to replace them. However some are certainly trying, like osh [1] that takes backwards compatibility with bash seriously, which makes adoption easier. Maybe it'll be like the C++ vs Rust situation? https://www.oilshell.org/ https://www.oilshell.org/