They also fail because Apple intentionally sabotages the battery life monitor in older phones when the OS is upgraded past a certain point.
And automakers are infamous for planned obsolescence, from using plastic components in high wear and temperature cycle areas to flat out inadequate designs and catastrophic paint failure. However, they shot themselves in the foot so often with mass failures under warranty and recalls that cars have vastly improved in terms of reliability.
#44 they fail because some dumbass sat on it and broke the screen.
I just saw a Amazon delivery guy flipping his cell phone end of end several times as he walked around....