Not sure I agree. Also depends of the domain. The python ecosystem is of course a lot richer for anything AI. But try to open, manipulate and export spreadsheets. In python you pretty much need a different library for every excel file format (xls, xlsx, etc) and usually the more file formats a library can handle, the least capable it is (eg pandas). In .net you have libraries like spreadsheetgear that are super powerful, including their own excel calculation engine. I see nothing remotely close in python.

The point is that a good library usually exists for some language, which is not necessarily the one you are currently using.

IMHO, we don't lack good libraries in XY, we are lacking good interop. Going through REST or stdio is quite painful just to render PDF (or export spreadsheet, ...)