Is there not an argument that favours one better pump compared to two others (simpler plumbing, and if a single pump stops working suddently then the engine dies with it, rather than losing 'half' the fuel if one of your twin pumps dies and leaning out massively as a result..which is potentially worse for the longevity of the engine when you're giving it some stick)?

This is all hearsay mind, I do not know enough to argue one way or another, but it seems somewhat logical, but I would be interested in arguments around the idea of a single better pump versus two....if nothing else than I would learn from it.