Whitney Houston & Frank Sinatra never wrote any songs. Neither did Elvis Presley (although he got co-writing credits for them because of Colonel Parker). A very small precentage of singers/bands self-wrote their material. Are you saying they all have no involvement with their records like they're A.I. or something? I also don't get this idea that self-writing is supposed to have some personal meaning. K.C. & The Sunshine Band wrote their songs and it's mainly party lyrics (Shake Your Booty, I'm Your Boogie Man, Boogie Shoes, etc.)
I just think people should stop being hypocritical and embrace things like they are. When people say something like "oww, whatever happens is not even Michael Jackson song, he just got credited on it with no reason", while Thriller, Rork With You and She Is Out of My Life are not Michael Jackon's songs too! This is hilarious.
And the point, that Michael Jackson was a guest on his own album? I mean, why?
In the way of songwritting? Well, no, he wrote 2 songs on his own. And lots of sogs lyrically connected to his life. He wrote 4 songs on Thriller and also 2 songs on Off The Wall. So it'not much different from Invincible
In the way of musical sounds? Again, no. Invincible has it's own specific musical touch, that would only MJ do. Same old beatbox of same old MJ. Invincible is just Michael Jackson simply being Michael Jackson, nothing special. I mean, there are a few songs, that do not sound like MJ songs to me. Like Heaven Can Wait, You Rock My World, Butterflies and Whatever Happens. But they are just an exception.
And just because there was a few times, when Michael Jackson didn't show up in studio, doesn't mean that he was a guest. It means, that he was going through tough times. And wasn't really in shape for working.
Invincible album is ruined MJ album. Still it's MJ album. Good or bad, it's not important. It's part of MJ discography.