Arbitrary examples, I know, but I moved a large software that was truly mixed C++ and python project to conda-forge and all sorts of random C++ dependencies were in there, which drastically simplified distribution and drastically reduced compile time.
If I had done it today, it might be nix+bazel, or maybe conda+bazel, but maintaining a world of C++ libraries for distribution as wheels does not sound like fun - especially because nobody is doing that work as a community now