Filesystem-oriented flags: sad, messy and not going away

In these days of flatpack and image-based application distribution, where applications ship with private versions of all of the shared libraries that they use, it's easy to argue that the days of shared libraries being particularly useful, at least for supposed benefits of disk space or memory space savings, are long gone. From a language point of view, the model of separately compiled object files is too restrictive, and too much of a barrier to efficient abstraction. Most modern languages have a whole-program compilation model, and that includes C++, except for the cases where modules effectively isolate themselves behind a C API. (Go, rust, julia, haskell, all of the lisps...)
I view this trend as a good thing, btw. The modern languages have a lot going for them, and shared libraries really don't.