Right, we (Chrome team) definitely care about multi-input-device scenarios (I started at Google by leading the chrome work for the chromebook pixel). We're just trying to project out 5-10 years where we expect most Interent traffic to come from phones/tablets to a mobile-first (touch-first) world - rather than carry the baggage of the mouse-centric world. Here's some ramblings on how we may be able to evolve touch events to fill this need: http://crbug.com/404128