Yes it is unneeded complexity.
Note: I can't get a 'retransmission' of what comes out of the groove on my LP.
I don't think cost was a main motivator; look at the price of Krells until D'Agostino sold and the price of D'Agostinos now. More like 'price no object'. Neither was lowering the weight and size an issue. Just look at today's big amps, even if they are all AB hybrids.
No, the green lobby was the big motivator as I suggest in my post. That is why there are few pure Class A amps today and to my knowledge no really big ones.
I want the dynamics I paid for in my media (mainly LPs). That's why I keep the KRS200s (in fact uprated to 400w/side for a UK Krell dealer, from whom I bought them way back.