Why matters that is written in Rust? Because there are already a few JS tools written in Rust, so you can now use the crates from projects like Deno[0], OXC[1], BiomeJS[2], etc to write your own tool with minimal effort.
Also note that the Vite team is writing Rolldown[3], and guest what? They are writing it in Rust.
None of those tools you quoted are production ready based on my investigation, in the sense that if you manage the JS infrastructure of a company of 2000 developers, you would stick with webpack. Lots of Rust based tooling is still half baked and missing things here and there, so much that you wish these people work together to create one (or at most two) tool that is comparable to webpack.
> None of those tools you quoted are production ready based on my investigation
This is very true and almost all of them are taking far longer to develop than they initially thought. swc/turbopack is being pushed by Vercel and it has been a huge ongoing disaster.
Yeah okay, but that's not the reason why people write it in the title. They write it in the title because they know that many engineers like Rust and think people will immedietly be drawn to it.
But the language itself is not a goal or at least shouldn't be IMO. Thus it have the opposite effect on me, who do not care about what language my bundler is written in.
If I did, it still wouldn't have any competitive advantage since as you point out Vite will soon also be based on Rust.