I don't think talking about normal everyday situations is "corny" in fact it humanizes rappers in my opinion and it's apart of the appeal
of several rappers before and after Kanye. And honestly I think your opinion stems from what I'm assuming is an introduction to and fandom
of Hip Hop that was/is mainstream. The problem with this is before Kanye there was De La Soul, Q-Tip, The Roots, Aceyalone, Myka Nyne,
Murs, Slug etc.
And personally I don't find his writing style "Corny".
When Common talks about how alcohol has a hold on him, that makes him HUMAN not a moralizing, condescending, "conshush Rappa" cliche.
When Kendrick talks about going "Too fast" with a girl and ending the show early that makes him, HUMAN.
When Mos Def talks about getting blown off/played by a woman who is flustered when she's introduced to him later, it adds humanity to
his rhymes that gets lost in the "Drugs, bytches, Hoes" or "Guvment, illuminati, Hotep" speech of other rappers.
Too me what Kanye did (in a mainstream sense at least....) was brilliant and this came at a time when Gangsta rap was practically
made of fukking teflon and talking "normal" things wasn't "cool". This was the polar opposite to "Many men" 50 cent or "The barrel in my apparel
can stop god...." Jay-Z or the brag ridden rhymes of other "Street" or "Gangster" rappers. And I'm not saying that to say Kanye
is a stranger to bragging cause he most certainly isn't.
With that said I'd say this sorta writing style is actually pretty common in a lot of African American Music and the pictures it can and does paint.
And it's likely one of the reasons that for example the Blues was able to have such crossover appeal in Britain. It had the music
obviously but lyrically it spoke to people thousands of miles away much like Hip Hop does in 2015.