I still think the answer lies somewhere between. The front end needs to achieve a certain standard, but from then on it's mainly a case of scale, so bigger rooms require a bigger amp and speakers, and US rooms tend to be consuderably bigger than in the equivalent UK home.The anti-Linn demos were the ones that Wilson ran 15 years ago, using an IPod as source. Ostensibly to show it's: speakers >>...> source, re importance/heirarchy.
So they're both rightA US system would require a larger share of the total on amp and speakers than you could get away with in the UK