I think you're excessively hung up on the example of everything happening within a single team inside a single company or some such thing, when the author of the submission wrote about making a choice for themselves. You don't start coding in Lisp out of nowhere when working in a Java shop on a CRUD app. But if you're charting your own course, it's great to be able to choose whatever suits you best.

I can't count the number of times someone published their open source project and inevitably people in the comments started questioning their language choices, because they wouldn't be able to use it in their "team", and how that choice is ultimately harmful for "the community". Now, you're not doing that exact thing here. I'm just thinking about how all that focus on "the team" and "the community" often goes too far.

Personally, I'm not going to do anything in Common Lisp, but I'm always happy seeing other people doing their projects in that language (and many others).