As I said in other similar answers, there are some context where you can't use other languages or install packages but bash is everywhere (as example).
About Fish we are planning to support more bash subset but we aren't so much in the team to focus in everything.
Right now the priority is to adds more stuff to the language in a way we can stabilize it and implement the other "output" target later.
About the production ready the Bash code is tested, shellchecked tested (we are not at 100% yet) and works but is an alpha because we are working in the syntax.
As long time volunteer contributor in Mozilla (I am in the firefox credits and in the monument) it is very sad to say that I agree with you.
I have my opinion on why this is happening and my explanation is that in Mozilla they lost their memory because they act as a company and not as a foundation (they have both the identities).
With the layoffs they removed a lot of people working there for years that knows a lot, they lost the historic memory and I remember a lot of discussion with employees that had no idea that there was a community or that they have no idea what is a GPL license.
I mean in 2018 I remember reviewing this as part of the Mozilla Reps council, https://github.com/OpenTechStrategies/open-source-archetypes that was created to help the employee to understand OSS but I think that after the managers that created moved away it was just left as it is.
Sorry for the flame but I think that when a foundation act like a corporation there are issues.
A surprisingly common misconception about Paged Out! is that we have some super strict acceptance policy. In reality we almost never reject articles and try to work with authors to improve them if there's any need for that ;)
But if you feel worried, our Discord is open, and you can also just email us with an article topic idea and we'll give you feedback on it.
As I said in other similar answers, there are some context where you can't use other languages or install packages but bash is everywhere (as example).