I think of Vala as the “Swift of Gnome”. As in, a nice language primarily useful for programming in the World Of Gnome, like Swift is a nice language for programming in the World of Apple. I don’t use Gnome, so I’m not interested in their Swift. ¯\_(ツ)_/¯
Similar to a language like D. Technically quite good, but not quite compelling enough that it has picked up momentum that is likely to push it into the mainstream and generate a large library ecosystem.