Per contra, I always specify:   use strict; use warnings; ... and if there is any exception to that rule, I will place a no warnings "foo"; directive thereafter.   (If the unwanted warnings occur only in a specific block of code, the directive is placed on that block of code, then countermanded... and descriptive comments abound.

In my experience, the warnings are usually correct; sometimes even prescient.   Computers simply don’t “overlook” things like aging humans do.