These bundlers do not do the same work as webpack. Turbopack is using swc for typescript which means it will not do typechecking during compilation which effectively makes it fairly useless as a compiler. Now, if you only want bundling and minification then sure but why would anyone want only bundling? Good luck having a sensible workflow when your type checking has to run separately and perfectly match whatever typescript version is hidden inside your bundler, good luck dealing with constant mismatches when there are errors on either side.
EDIT: The responses pointed out that the author is the maintainer of webpack, I removed that part of the comment calling it deceptive. Maybe the entire intent is to deprecate webpack. I still think that it should be renamed to "Turbopack: our webpack successor" because calling it 'the' successor is a bit presumptuous and the article doesn't even directly say that.
EDIT: The responses pointed out that the author is the maintainer of webpack, I removed that part of the comment calling it deceptive. Maybe the entire intent is to deprecate webpack. I still think that it should be renamed to "Turbopack: our webpack successor" because calling it 'the' successor is a bit presumptuous and the article doesn't even directly say that.