Agreed. In many more regulated industries (medical devices, automotive, aerospace) the kind of testing you mention is required by law. In all cases it's good

Agreed. In many more regulated industries (medical devices, automotive, aerospace) the kind of testing you mention is required by law. In all cases it's good form, good practice to test your product to make sure it works as promised by its labeling. Typically you put an operating temperature and humidity range in your manual or labeling. In many industries testing to those operating parameters is required by law.