The only thing I would say against this is that sometimes that kind of curiosity can help the business itself as well. For example imagine a situation similar t

The only thing I would say against this is that sometimes that kind of curiosity can help the business itself as well. For example imagine a situation similar to the post except that it's someone's job to manually write the equivalent of "Please do not write below the line" on every letter. Sometimes little tasks like that can waste time for years before someone finally asks 'do we actually need to be doing this?' I do realise that is not the case in the post, where it's probably even simpler to print the same message on every letter vs. only on some. And your point is of course well made in general.