If I understand it right, the idea is that you should use debug versions of your vcpkg builds when you are doing Visual Studio debug builds of your project. It's a different approach compared with for example the Windows SDK where all libraries are release builds. I guess it can be useful in some circumstances, but it surely adds complexity. I think if I add the -nodefaultlib linker option and the -Zl compiler option to vcpkg static library builds, I have a choice to do either way. If so, how can I add these options in a convenient way?

edit:
There's also the issue of mixing vcpkg static library with dynamic linked libraries. A thing you most certainly want to do.