There are many cases where bash/shell is better than Python. For one, any time you're just stringing together 2-4 existing shell tools, bash has unbeatable speed since it's all running in C. Plus, you should probably learn the tools anyways to handle CLI stuff on a day-to-day level, so the knowledge is reusable and becomes very intuitive to compose into some crazy one-liner piped chains of commands. If I just want to loop over a set of directories and do a couple chained CLI commands on each directory, this is the way I go.

That said, in cases where you're doing something very custom, any time you're doing something that can't be simply described as a chain of CLI tool transformations, and any time you want to maintain a global state across a complex set of operations outside of a pipeline, I agree that Python is generally a more robust solution with much easier maintainability.