I think you're possibly making a faulty assumption here. You're right that "written in Rust" has no particular value to people who just want to use the thing, b

I think you're possibly making a faulty assumption here. You're right that "written in Rust" has no particular value to people who just want to use the thing, but that's not the only perspective people bring to open-source software. When somebody markets a project as "X written in Y," I generally assume they're marketing to people who might want to hack on it, and it is relevant from that perspective.