I really love the project structure of C++. I know that it is an archaic design developed like this due to lack of resources, but I find packages extremely offputting.

The first reason is that splitting declaration and implementation across files makes it easier to figure out what something does.

Second reason is that I feel that I have more control over libraries and packages that have to be manually added to a project rather than using a package manager.

Third, I feel like modern languages iterate over too many versions too fast. C++ has version releases too, but I feel that versioning is handled better from time, compatibility and stability point of view.