Announcing with Rust in the title is not because of a hype train, it's a way to communicate that this bundler is in the new wave of transpilers/bundlers which is much faster than the old one (Webpack, Rollup) which were traditionally written in Javascript and painfully slow on large codebases.
While the JS ecosystem continues to be a huge mess, the solution to the problem is not LESS software development ("Just stop making more bundlers & stop trying to solve the problem - give up!"). Or even worse - solve the problem internally, but don't make me hear about it by open sourcing your code.
The huge amount of churn and development in this space has a good reason... it's a desperate attempt to solve the problems that browsers have created for web developers. Fact is that most business has moved to the web, a huge amount of web development is needed, but vanilla javascript can compounds and compound in complexity in the absence of a UI framework and strict typing. So now you've added transpilation and dependency management into the mix - and the user needs to download it in less than a second when they open a web page. And your code needs to work on at least 3 independent browser engines with varying versions.
SwiftUI devs are not a more advanced breed of developer than web developers. So why don't you see a huge amount SwiftUI churn and framework/compilation hell with native iOS development? The answer should be obvious. These problems are handed down from on high
The browser/internet/javascript ecosystem despite its glaring warts is actually one of the most amazing things humanity has created... a shareable document engine grew into a global distributed computing platform where you can script an application that can run on any device in less than a second with no installation. Not bad.