I can speak to the first half. I used to be the solo dev of a popular Android app and kept getting weird crash reports from Samsung devices. Only after decompi

I can speak to the first half. I used to be the solo dev of a popular Android app and kept getting weird crash reports from Samsung devices. Only after decompiling the Samsung Android framework, I realized that one of the "features" they added kept making some unguarded `.equals()` comparison that kept throwing null-pointer exceptions because the String wasn't guaranteed to be non-null.