Yep - those are reasons I have heard - and I've seen vehement discussions arguing for the opposite (some science, but mostly not - the amount of science is generally inversely proportional to the vehemence of the discussion)
But, looking at the market, across every price range, there are single driver and multiple driver examples, so I'm assuming there are valid arguments for either approach. Be interesting to hear what the brains at Axiom have to say.
(and an aside, it is a very cool thing that, on these forums, it appears that they actually will chime in)
