LaTeX (and documents) as first-class citizen
Opening an issue, as per suggestion by Brad.
Do note that I currently don't author many LaTeX files on a daily basis, but when I do, I wish the process were a little more streamlined. It's not necessarily the lack of features that frustrates, but as I mentioned, how immediately "modern CMake" style breaks when something is not understood by CMake. (It is my primary frustration with CMake actually.)
I believe LaTeX could pave the way to many more document formats with a well defined compilation model.