| why not quads?
Complexity and cost, two engines are needed for manouvering but you don't need four so the only reason to have four is bacause IPS don't have big enough units (at the moment)
As an owner I would be hesitant of the extra complexity, and what may become quite a cramped engine room, but I suppose it has the benefit that if one engine goes down you have 75% of power left and not 50% so you can get to the dock quicker?
It's going to take a few years to settle out where and how these systems fit into builders ranges, builders are a cautious lot and they are gathering feedback and results from the units they have fitted.
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