If uv figures out a way to capture the scientific community by adding support for conda-forge that'll be the killshot for other similar projects, imo. Pixi is too half-baked currently and suffers from some questionable design decisions.
The key thing of conda-forge is that it's language (rust/go/c++/ruby/java/...) and platform (linux/macos/win/ppc64le/aarch64/...) agnostic rather than being python only.
If you want you can depend on a C++ and fortran compiler at runtime and (fairly) reliably expect it to work.