Thats because you have divided the languages by properties and i´ve originally divided them over the class of software that can be written in those languages.

Thats because you have divided the languages by properties and i´ve originally divided them over the class of software that can be written in those languages. More as "system language" category, where you can code OS´s, JIT compilers, Browsers or any time/memory sensitive kind of software. Thats why they were packed together. Classically, those sort of things could be only coded in C and C++ as the attempts in doing them in "higher level" languages mostly failed.