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

This statement is false.

You are false, and have no idea about the BS you spread sometimes, eg Zeroformers, OTL’s drive capabilities etc etc

Do your homework before posting this **** you spread.

I’ve built many Class-A’s from 20watters to 150watters, including massive 2 man lift self contained water cooled ones

Get off your horse, stop the BS and concentrate on your own "so called patented Class-D" I can link to on another forum, because it will be left behind and over taken with cheaper ones coming out the rate your going.

Once again

You can prove this for your self by listening to an amp with user switchable bias while listening. EG Parasound JC1(low/high bias), Gryphon Antillion (low/high/higher bias) etc etc.

The difference you hear with more/higher Class-A bias, is an easier, smoother, richer presentation to the sound, that’s no less dynamic and yet makes the speakers disappear, even as the music goes louder. And as a result the sound washes over you rather than being fired at you from the drivers, and that is the result of the lessening of the class-B xover distortion when you engage more and more Class-A bias.

Cheers George

Ralph - Let me know if you need a Beta tester, I can pay the freight both ways. My systems are visible in the virtual systems page. I appreciate your balance of the theory and practical application ( the hard work of design ) I also appreciate that you understand the ear / brain sensitivity to and preference for certain types / orders of distortion. A deep understanding of that can greatly inform the design objectives for any amplifier.
jim