It is no secret GM manufactures quality vehicles far superior to both Ford and Chrysler. Many Americans are simply confused into buying poorly engineered and manufactured vehicles whether Domestic or Foreign. GM continues to be a pioneer in vehicle development having completed its fuel cell research years ago, and, continues to advance it's electric (again pioneer) and autonomous vehicles (Honda is seeking venture).
Being an expertly guided company GM is scaling back to protect its futures while eyeing weak domestic sales forecasts, in part, due to the rising cost of manufacturing (a la China tariffs). Our market drives the innovation of top vehicles (caveat venditor) leaving GM with no choice but to "hang in the valence".