I'm not sure what you're referring to because when justification is enabled Typst uses almost the same line breaking algorithm as TeX. [1]

One problem we had was over-eager hyphenation. We've addressed that recently. [2]

[1]: https://github.com/typst/typst/blob/9b001e21121ab7b5645aa36f...

[2]: https://github.com/typst/typst/pull/4584