It was heartbreaking to see the control room during the first few minutes after the landing. Imagine a project you've worked on for years going kaput and you won't even know why. None of these engineers will find sleep tonight. I hope some moon orbiter can take pics of the landing site soon.
Not necessarily. We've frequently been able to determine the cause of unmanned spacecraft failures via telemetry and/or post-failure investigation. For example, https://en.wikipedia.org/wiki/Mars_Climate_Orbiter famously failed because NASA used metric and a vendor did not.