Or just possibility to do syscalls to do something. What is more important then new syntax and sugar over basic instructions.
(They are probably “useful” in the dissemination of what the real essence of computation can reduce to, in practical terms.)
Not everything needs to be useful in fact: certain things can be just enjoyed in their essence, just looked at and appreciated. A bit like… art?
I am implementing my own Scheme as well. Why? I don’t know, one needs to do things that serve no apparent purpose, sometimes.
Our objectives might, and most probably will, be different.
Or just possibility to do syscalls to do something. What is more important then new syntax and sugar over basic instructions.