I agree with your list. However, I don't find the first library you referenced readable (i.e. https://github.com/hanickadot/compile-time-regular-expressio...), and I am a C++ user since the nineties.
constexpr seems to try and step in, but there still is a large codebase around which is hard to maintain and extend. IMHO D and zig show that it can be better to have compile- and runtime-syntax much closer together.