Here's the an important piece of real-world statistics for you, which I've read about in research papers and personally verified in large-scale systems:
For every 1 complaint or help desk call you receive, there are between 100 and 1,000 users that experience the same issue but didn't bother to complain or call.
Production testing is literally 0.1% to 1% as effective as actual testing.
For every 1 complaint or help desk call you receive, there are between 100 and 1,000 users that experience the same issue but didn't bother to complain or call.
Production testing is literally 0.1% to 1% as effective as actual testing.