I consider dependency management a very important part of a maintainable software project. Once you start writing software that depends on other code, it can quickly become unpractical to do dependency management by hand, so a good system is necessary to make it easy to work on such projects.
Since C++ has been out for a while, I expected to find a very mature ecosystem in this regard. Looking around and reading a little, I found that there is no community agreed way of solving the problem of managing dependencies. One reason for this seems to be that it’s not easy to build a system that helps you do dependency management when there are many ways to build a package.