I think is that modern languages like Go and Rust (there are for sure others, but I don't have experience with any other language that ships with all the tools) ship with all the tools you need, formatter, linter, test runner, etc, Go goes even further than Rust and ships a very complete std focused on web and Javascript is used primarily in web, so it makes sense that ships with all the libraries needed to build a web server, also websocket is a standard, so it's easy to implement it and make it work with the browser.

Nowadays if you start a new Javascript project you need to setup, vite/esbuild/webpack, eslint/oxlint/biome, prettier, typescript, etc, that is a ton of dependencies that YOU need to maintain for years, and if it is part of the tool you are using, then you don't, ideally there shouldn't be a breaking change, let's see how bun manages that when the time comes.

I am waiting for bun or a tool that has everything I need to bundle my frontend app, I'm very tired of fiddling with all the dependencies and try to make to work every dependency together, I have a legacy project that I work on, I would have migrated a long time ago to another tool, but there is none that would fix the current issue and it's managing the project build, test, formatter, lint dependencies, after using Rust I feel super frustrated with the Javascript ecosystem state.

Also you asked why? I want to work on the project, there is already a lot of work to maintain the dependencies up to date, the tooling should not be part of that work.