That is not at al a niche use case, at least on a general-purpose system. Shared libraries on Linux, like most modern OSes, are also shared in resident memory a

That is not at al a niche use case, at least on a general-purpose system. Shared libraries on Linux, like most modern OSes, are also shared in resident memory among programs using them. For very common libraries like TLS, readline, or GTK that can be a big savings.