Maybe this is a bit much, but developers do need some data as to how their app is performing in the real world. You might have some metrics that says 0% of visitors to your order checkout page on FooPhone 1.0 are completing orders successfully. With a screenshot, you can immediately see that that screen doesn't even work on that device. It doesn't sound like a tragic loss of privacy to me, but rather an important tool for developers to help smooth over the reality of massive device incompatibility.