Yep, correct, it comes down to acceptance. And I've yet to see a large scale scenario where it was not possible to implement software which couldn't be both cor

Yep, correct, it comes down to acceptance. And I've yet to see a large scale scenario where it was not possible to implement software which couldn't be both correct and performant (I specialize in large scale applications for a living). Therefore, I do not accept the premise that it is impossible to design systems which are both correct and fast on a large scale, and neither should anyone else have to accept such a thing. It's just not right.