This is indicative of a larger issue - testing is probably as difficult as solving the halting problem i.e. code could be generated from proper tests, yet teams

This is indicative of a larger issue - testing is probably as difficult as solving the halting problem i.e. code could be generated from proper tests, yet teams tend to trust their tests completely. I see high profile websites having severe usability issues or being outright broken in ways that would be immediately caught by "interns randomly click here and there" usability tests. But these version got deployed probably because testing did not show any regressions. I tend to believe that if user complaints about new problems or regressions increase over statistical noise - there is a problem.