Rust has characteristics that basically represent a value proposition for the user. An OS that can be higher performance, better at concurrency, more robust, and more secure sounds pretty good to me. They could make those claims and I could not believe them or they could tell me it is written in Rust and I would hope for all of them.

Of course, the language is not a guarantee of anything but it does tell you something about the tailwind that this project will have.

Python implies a bunch of things as well. None of those things make it sound great for an OS and I would assume the worst if an OS project told me they were using Python ( for the core ).

Personally, I am very glad that they tell me the project is written in Rust. I am sorry it bothers you.

It sounds like a elective complaint about Rust though as most OS projects tell you the language up front including C and C++. C++ seems especially eager to announce itself as a superior choice to C. I have not done much research but can tell you what language even most commercial operating systems are written in as they are usually pretty open or even vocal about it. Sometimes they are proud of what the did not pick ( see Linus opinions of C++ for example ). Haiku and SerenityOS, in contrast, brag about C++ and have even made YouTube videos about it.

It is not just OS projects either. I mean, why does GitHub display the language used as a standard project feature after all?