Why would anyone want class AB amp when class A always sounds better ?

Yes but take away blanket assumptions and there goes 80% of site content. Take away pure unsubstantiated blather and there'd be like three of us left all reading each other.

Miller, what's wrong ? Give us an example. I'll give it myself. Gryphon Diablo 300 class AB integrated sounds better than Sugden class A integrated. But it's not a fair comparison, not what I mean, of course.

Well honestly now I don't know what you mean. In the OP you say "Class A always sounds better." But you just gave an example where you yourself say class AB sounds better. So you disproved your whole point. While proving mine: Class A does NOT always sound better. But then you ask me what's wrong? Nothing wrong. I am right again. As per usual. 

Why would anyone want class AB amp when class A always sounds better ?

Because Class A does not always sound better. Obviously.