2nd data point, I'm using Galaxy s8+ from 2017. I haven't taken great care of it so the back glass has many cracks in it. However the front glass has no cracks,

2nd data point, I'm using Galaxy s8+ from 2017. I haven't taken great care of it so the back glass has many cracks in it. However the front glass has no cracks, minor scratches but is otherwise in great shape. I don't notice the scratches when I'm using it, but they're easily visible when the phone is off and held at an angle in the light. I'm still very pleased with the performance and the battery life. I did not expect it to last more than 5 years.