There are plans to add namespaces AFIK, they are just quite early stage.
Through for a long time (part of rust developers) haven't been very happy with the idea. a stuff like `abcde/bar` vs. `abcbe/bar` are a total pain. But there where two points which pushed things in the direction of having them. 1) Differentiating between 1st and 3rd party extensions of a project (e.g. is actix-XXXX "blessed" by actix or not) 2) companies want this for a bunch of reasons.
Gosh they really should have used namespaces, huh.