I feel like we're getting a bit sidetracked with the "Honda should have" engine talk, which is fine but I'll mention that we have had 2 Toyota Highlander Hybrids -- currently a 2015, which has a 3.5L V-6 and supposedly a combined 280 HP in an SUV that only weighs a few hundred pounds more than the Clarity. Driving the Highlander, up hills especially, is just as buzzy and loud as the Clarity with the sound out of sync with the acceleration as on any hybrid.
In fact, the Clarity *feels* smoother because the Toyota system physically connects the engine and wheels via the planetary gearset so you feel a little bit of jerkiness/torque steer every time the engine kicks in, while the Honda system is purely using the electric motor (other than "gear mode", which only engages under steady light load so I've never felt it at least). And the Honda brakes blend regen/friction a lot more seamlessly than the Toyota, but that's another topic. Yes, the Highlander might be a slight bit quicker (both are in the 7 second range 0-60 though) and the engine sounds a tad more "refined", but it was also literally twice as expensive before even considering the tax credits...and it uses gas every trip and only gets 25-30 MPG doing so.
Don't get me wrong, we love the Highlander for SUV purposes, including having done some basic off-road 4wd type adventures, but that's not what I bought the Clarity for. Personally I'm satisfied with the optimization they chose; I wouldn't want to carry around a bigger/heavier/more expensive engine nor a bigger gas tank everyday at the expense of even a few miles of range. As is, for me it's a great everyday 40-mile commute and around town car that can also respectably handle a long (on-road!) trip.