Re Elizabeth's statement: Bombaywalla, I know that you have considerable technical expertise and relevant experience, but upon careful reading I don't see anything unreasonable or technically implausible about Elizabeth's statement. In its essence, at least, which as I read it is:
A few folks are able, with effort to make it work for themselves. In general it is a waste of time, if as much effort was made to have one amp work well. The worst side of it is all the folks who know nothing about it wanting to do it as if it is some easy magic panacea.
I have seen (and answered) more than a few posts here that would justify the last sentence of that statement. (In saying so, I am not implying that the OP in this thread is one of them).
Regards,
-- Al