Use what you make yourself.
In the computer industry, it is the practice of organizations that develop and use their own products to test their products while the organization uses the products themselves on a daily basis in actual usage. dogfooding - Wikipedia
It is difficult to persuasively sell a product to others that you have never used yourself. This is expressed humorously as βa dog food salesman tries dog food.
relevance - Use your own deliverables.
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