Ayo whattup. Once again you in the presence of the mighty Hands Of Zeus aka Galaxy Knuckles aka Thor Molecules the great aka Phantom Raviolis aka Shampoo Bracelets the panty melter aka Broccoli Bundles aka Lamborghini Saxophones aka the illustrious Cocaine Biceps n the legendary Acrobatic Chromosomes hisself otherwise known as the world famous Big Ghost namsayin.
We also shouldn't forget that many rap songs have real composers. Pimp C was heavy with sampling, but dude was also able to lead his high school band class, plus the organ was his signature instrument. DJ Quick and his guitar. Johnny J, Questlove, and many other composers, real musicians, exist behind these beats. They'll often pay musicians to come in to do a few riffs and progressions(all original and some covers) for a song.
A "producer" without musical education is lacking, that's just a fact. A seasoned musician is well within his right to point out if your ignorance is your bliss.
But rappers should be given credit for their artistry as song writers, their crafting of words. I doubt your Quincy Jone's, Fela Kuti's, and Walter Beasley's could match your favorite rapper/battle rapper in a freestyle.
But an "artist" that doesn't rap/sing they own shit and doesn't even compose.... that's what we don't need in the game.