However, I need to know sh/bash well because they're the tools installed by default; in any "well-established" organization, getting approval to install a new shell will range from "12 to 24 months" to "impossible". And without that, I'm not going to put in the effort to learn a new tool that is only useful some of the time and requires massive context switching.
[1] https://en.wikipedia.org/wiki/ALGOL_68 [2] https://en.wikipedia.org/wiki/Bourne_shell#:~:text=Stephen%2...