Nobody cares, until the choice of language has practical consequences for the end user. E.g. I'm not touching anything written in Ruby because of my bad experie

Nobody cares, until the choice of language has practical consequences for the end user. E.g. I'm not touching anything written in Ruby because of my bad experiences with the mess Gems leave in the system. Nobody cares as long as your choice of language doesn't make the program into its own special thing that needs to be handled differently than all other programs. When it does, I will not only care about your choice of language, but also about your choice of toolkit (e.g. Gtk3 being out of place outside of Linux/Gnome). On the server it's less of an issue, because it's mostly the developer that needs to deal with the consequences of their choices, not the end user.