Because C++ has no way to compatibly adjust its syntax, it's important to them to reuse keywords where possible. So enum and class were two existing keywords w

Because C++ has no way to compatibly adjust its syntax, it's important to them to reuse keywords where possible. So enum and class were two existing keywords whereas scoped would be a new keyword. There's also a sentiment among C++ proponents that classes (a user defined product type with implementation inheritance) are all you really need anyway.