[yodsanklai]

Most of the time, we don't get to choose what programming language to use. It's dictated by professors, companies, platforms, application domains, available librairies, available expertise and so on...

[nine_k]

We still choose something to learn as a part of self-improvement and self-education.

Some languages are worth knowing even if you mostly use other languages, because of the way they change your way of thinking.

[m0skit0]

I think the author assumes you're free to learn whatever language you'd like.