I think, the lesson learned from › Python v. R ‹ is that people prefer doing data science in a general purpose language that is also okay-ish for data science over a language that's purpose-built for data science but suffers from diseconomies. Specifically: Imagine a new database or something like that has just come out. Now, the audience that wants to wire it into applications and the audience that wants to tap it to extract data for analytics put their weight together to create the demand for the Python library. The economies for that work out better than if you had to create two different libraries in two different languages to satisfy those two groups of demand.

You mention a good point of using Python to put out the results.

I think munging the input into a clean enough data set that you can work on is another place Python excels compared to analysis specific tools like R.