Me, typically I have found it to be a sign of over-engineering and found no benefits over just using shell script/task runner, as all it should be is plumbing that should be simple enough that a task runner can handle it.
> If it works it works, as long as you can run it locally, it'll be good enough,
Maybe when it is your own personal project "If it works it works" is fine. But when you come to corporate environment there starts to be issues of readability, maintainability, proprietary tooling, additional dependencies etc I have found when people start to over-engineer and use programming languages(like Python).
E.g.
> never_inline 30 minutes ago | parent | prev | next [–]
> Build a CLI in python or whatever which does the same thing as CI, every CI stage should just call its subcommands.
However,
> and sometimes it's an even better idea to keep it in the same language the rest of the project is
I'll agree. Depending on the project's language etc other options might make sense. But personally so far everytime I have come across something not using a task runner it has just been the wrong decision.