Chances are you probably won't see those names in big media.
How many distinct rap artists are currently in existence who claim to be professional? By professional I mean they have no shame in asking for money for their live performance or recorded version. My best SWAG is there are probably tens of thousands.
Why? For the reasons you supplied. Like any musical genre some rap performers can create meaningful products.
Most of them, I would imagine, can't play a musical instrument with any degree of proficiency, if at all. They've never taken formal music lessons. They can't even read a simple lead sheet.
But, digital keyboards are equipped with all kinds of add on features. The features can produce all kinds of add on sounds. Makes it easy to be a "recording artist."
What truly professional artists, regardless of genre, make look easy actually takes a considerably long time to perfect.