It's always seemed to me like one of the main perks of having your company use a weirder functional language was the ability to attract talent that preferred it to more standard choices. An experienced developer might be willing to actually take a pay cut if it means using a favorite language rather than grinding out another Python/Typescript CRUD app or what have you.

I understand where the author is coming from, but I think having a preference and being excited about a tool your going to be working with all day is a reasonable thing, and it's ok if developers are excited about a technology for its own sake as long as they can make that compatible with continuing to make the business work.