>>Was the Mauretania and Lusitania not Britain's answer to those 1st few german 4 funnelled liners ?<<
They were, but it's not quite as simple as you might think. The problem here is that Germany had the fast and fashionable ships and Morgan's IMM trust was trying to make some inroads on British shipping. The Cunard greyhounds were as much a part of the effort to keep a respected British line in British hands as it was to stop J.P. Morgan from taking over.
Fashion was a factor and that's a fair point to make but in the end, it was all about the money. Cunard and White Star wouldn't have spent a penny on fashion if it didn't fill the berths, and they weren't about to fill the berths if their ships were not faster, more comfortable, or both.