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


Cost ? Heat? Reliability?
inna
Class A does NOT sound better (as the thread starter claimed). I owned pure class A Krell monoblocks which definitely didn’t sound better than my current Pass Labs class A/B mono blocks. This statement of the threadstarter is way too general ...just like a V8 is always faster than a V12 or boxer 6 .... 
I had a lot (or heard -) of class AB amps (high-end): Luxman, Esoteric, Hegel, Audio Analoque, Jeff Rowland, Accuphase, Mark Levinson, d’Agostino,...not of them all ,sounds better than Ear Yoshino 509 monoblocks or Wavac MD 805m. : the purity, detail, 3D. If you really enjoy your music, this is the best. You can’t put it very loud,  but you have to to really enjoy it. Tubes get warm and have to be replaced after a while,but a real music lover will take that in. In transistor, I had a few class A amps:some of them sounds to “dark”, detailfull,rather “flat”.