Maybe, but you make it sound like it's always some Blub paradox inspired reason. That someone doesn't want to learn thing <X> might be they're totally fine wit

Maybe, but you make it sound like it's always some Blub paradox inspired reason. That someone doesn't want to learn thing <X> might be they're totally fine with <Y>; they can get work with it, they like working with it, whatever. Not everyone is always looking for the next thing, better or not.