Because I find that an interesting question. There are lots of experimental and somewhat esoteric things out there. And sure, it can be fun learning about them. But the proof is in the pudding, and if something is rarely useful for anything in production then it's more of an artisan entertainment factor and less of an actually useful programming language.
> But the proof is in the pudding, and if something is rarely useful for anything in production then it's more of an artisan entertainment factor and less of an actually useful programming language.
That's not true at all. In first place, what you can think is good for production, i can think otherwise.. Beside it there is a lot of things/paradigms/languages that we learn, to help us to either understand better the basics or because it is easier for beginners. There are a lot of Science and Research that you can just throw away, but that was super important for further development. Pascal, Smalltalk, Minix are example of technologies, that we learn(ed) and not necessary are widely used in production. Haskell helped me to understand is pure immutability is actually practical or not, and so on..