Well that seems awfully close minded. “Good writers” are those who can engage their audience, your perspective of a “Good writer” is simply a reflection of you as a target audience. No need to put everyone in your box.
Also Jay-Z isn't every rapper. I'm pretty sure even Jay-Z would agree most rap is not very substantive or saying anything new. It's cookie cutter.
If engagement is the new measure of good writing, then we are lost. Click bait is engagement. Tabloid material is engagement. Fox vs CNN and political trigger pieces are all engagement. None of it should be considered good writing.