How is "implemented in Rust" relevant for anything but bragging rights for using some obscure programming language.
Your software has not more inherent value just because it is written in Rust.
Your software has not more inherent value just because it is written in Rust.
Such comment would have made sense if this software was promoted in a more general board/website, but HN audience is mostly compound by developers, so technical aspects matter. On top of that, it also gives an idea about the popularity of a programming language.
Free software lives as long as people keep committing to it. If people want to learn rust they will maybe do so through contributions to free software. You see where this argument us going, language matters.
Why is it featured so heavily, instead of just in the build instructions? I don't know. Marketing? It appears to be by developer(s), for developers, and in the dev space Rust is very vogue right now.
Why do you assume bragging rights are not relevant enough?
Languages get mindshare because people see others using them to make stuff. Bragging is essential for growing languages.
People interested in rust but not particularly pixel editors, like several in this thread more interested in the graphics stack/current state of rust gui/graphics than pixel editor itself.
If a tool solves my problem I just use it.