The problem with end-to-end crypto is that we often think of its security properties mathematically and neglect its practical performance. Obviously this is in

The problem with end-to-end crypto is that we often think of its security properties mathematically and neglect its practical performance. Obviously this is increasingly not true (Heartbleed probably did more to educate the world on crypto than anything else in history) but if you think of crypto as what it so often turns out to be - something waiting to be broken in semi-spectacular fashion - then I don't think it's so out of line to wish for additional assurances from complementary systems.