People who came into Python for ML and Data Science, and just care for their array and ML libs maybe.
But long time Pythonistas absolute use Python's standard library - and it's hardly "quite low quality". "Batteries Included" is one of the community slogans.
I use C# more days than not. The comprehensive standard lib is impressively large and accomplished everything I need. Third-party libraries is a real pain point though. I haven't looked in sometime, but things like sane PDF libraries, reporting libraries, etc. were severely lacking when I needed them last. As much disdain as I have for Java, I think it is better in that regard.
Even a decade ago (and more) the collections library in the Java standard lib was second to none. It's standard lib only got better since then (e.g. `HttpClient`).
I haven't used Java for a decade or so but as I recall its standard library was pretty bare bones (similar to Rust).
Apparently C# has a pretty comprehensive standard library but I've never used it.