I can't tell if this is serious.
Surely if you're still using C now it's for legacy reasons. And if using it for legacy reasons you are likely stuck using an old C standard.
So who will use C23?
How many of your preferred programming languages are written in C?
Yes, many self-host, but a considerable number of them don't want the complications that can bring.
Modern C compilers are written in C++.
So much for C's simplicity in writing compilers.
Yes, C can be simple for writing a compiler. [0][1]
No, optimisation, on the other hand, is not a simple problem.