I could learn all the programming languages in the world, but if I only end up using 5-10 of those languages, what use is that knowledge?
I think it is useful to learn things you might not ever use because a lot of concepts transfer over to different implementations. For example, when I was learning Scala I used futures. At the time async wasn't really a common thing, but I'm glad I learned it - understanding promises in javascript when it became a thing took me no time at all. I was also able to guide others on how to avoid antipatterns and the like.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
I think it is useful to learn things you might not ever use because a lot of concepts transfer over to different implementations. For example, when I was learning Scala I used futures. At the time async wasn't really a common thing, but I'm glad I learned it - understanding promises in javascript when it became a thing took me no time at all. I was also able to guide others on how to avoid antipatterns and the like.