The point of discussing these languages isn't always that you should plan to adopt it at your place of work tomorrow. Research into programming languages helps

The point of discussing these languages isn't always that you should plan to adopt it at your place of work tomorrow. Research into programming languages helps push the boundaries, and advances in PL research get adopted by mainstream languages eventually. Like how most high-level languages today support value assignment + destructuring, which came (as far as I'm aware) from more research-y ML languages. And not all research is done by university researchers. And not all of HN is solely industry practitioners. You just can't make huge assumptions about tech based on what you see on HN, basically. :) With that said, PostScript is a stack language, x86 can be treated pretty similarly to a stack language, FreeBSD's bootloader used to be in Forth (may not be anymore, I don't know). And I hear it's used in constrained/embedded environments. So I don't mean to suggest it's not a practical language either.