Unfortunately the reason why these systems fail on sharp turns is that the lane-line literally falls outside of the camera's vision. Aside from adding two more cameras (which I'd welcome) I cannot see them fixing it in software.
I totally would have purchased a 2016 Accord but no all-wheel-drive option. To me AWD, Blind Spot, Cross Traffic, and Eyesight made for one amazing overall safety package. The Accord has some nice unique features (e.g. Android Auto) but they need more than just Honda Sensing as OPTIONS.