Huh? All those "Not There" points seem very badly researched:
libc: musl and a horde of other small ones init/supervisor: plenty also, sinit from suckless.org comes into mind spontaneously High-level programming: ... what exactly are you looking for when you use C without macros? GUIs: There isn't just Qt and GTK, yk? Imgui, 60FPS, etc...
@torresjrjr Most of these projects are way older that that.