Jitted Elisp for itself has much more power because of function composability than badly reusing libraries without even a common API like OLE/COM under Windows. You are just creating silos badly interopearting together.

Even 9front has something like 9p, namespaces and everything it's truly a file. Even GNU/Emacs under Hurd doesn't have its full power developed until the GNU people ditch Gnuplot for their own GNU-born capable 3D plotutils and the like.

And today given the speed of jitted Emacs if I were the Calc maintainer I'd try to write a PNG/farfbled (or whatever it's called) plotting tool in pure Elisp, with both TTY and graphical outputs.

Depending on non-GNU, external tools it's holding GNU and Elisp back.