I find it really counterproductive whenever people bring the following arguments to the table (during discussions): "I don't use it" or "Facebook does not use

I find it really counterproductive whenever people bring the following arguments to the table (during discussions): "I don't use it" or "Facebook does not use it". So? What does that prove? Who taught you gentleman, to use such useless arguments in a debate. It sounds like "I do not believe unit tests are useful because I do not use them". Your logic is reversed. BTW Einstein did not unit test either.