I understand the criticism that languages should be pragmatic choices they serve the strengths of the project at hand, but I guess I always found most projects boasting they’re written in a specific language or framework are doing so precisely because of the overarching interest in the language itself, which seems like a perfectly valid justification for such projects to me.
I’ve seen the more cynical hype-driven stuff, but it’s inevitably superficial on first glance, where I have seen some real curiosity and exploration in many “Project X - Built In Rust/Go/Cobol/D/Whatever” and I think they’re exploring the dynamics of the language and tooling as much as anything else.