[materielle]

The code might be closer to your wish than you think.

So, they stay on the bleeding edge if C++ compilers. So in terms of core language features, they are C++20-something.

But, everything is written from scratch, including the standard library.

As such, the code is a lot cleaner than a typical C++ codebase.

[sylware]

The problem is c++ itself, with its grotesquely and absurdely massive and complex compilers, mechanically due to its syntax complexity. And yes, rust is hardly less worth.