Yeah for better or for worse compatibility is king. I despise shell scripts, they are an absolute nightmare to work with and full of footguns. But they are so commonplace that people are not going to tolerate YOLO breaking changes.

Yeah I think ESH

While we have more modern shells the fact that bash (or even sh) is the "common denominator" 30 yrs on is both good and awful

We need a PowerShell for Linux