Most of the beatbox stuff I see is them trying to be super fast or
Make some fancy tricks.

They never do simple beats or accompany some music or something.

I myself do beatboxing along with humming but I do actual songs and full songs.
And the beat is simple but I keep a beat to the music and not making fancy fast stuff.

They basically show off for attention aka YouTube.. The 'fancier' the tricks the more viewers and money they make. But classic beat boxers as I can imagine like you are the real ones.. Ones that you can make real music from