The programming language can have definite business impacts. It can impact hiring, salary costs (if the skill is rare), ramp-up costs (if it needs to be taught), etc.

Even bus-factor comes into it.

Software engineering is an important skill to recruit for. Too many times I see "Java Developer"... Like, do they only know Java and are absolutely incompetent when it comes to something else?

I don't even want to recruit or be recruited with such a title.