Designer, implementor, user, writer A Fragment by Donald Knuth dl.acm.org Thus, I came to the conclusion that the designer of a new system must not only be the implementor and the first large-scale user; the designer should also write the first user manual. The separation of any of these four components would have hurt TeX significantly. If I had not participated fully in all these activities, literally hundreds of improvements would never have been made, because I would never have thought of them or perceived why they were important. Eating your own dog food making
Just a whinny again "There was a time when, for me, a camel's whinnying was nothing more than whinnying. Then it became a signal of danger. And, finally, it became just a whinny again." Paulo Coelho, The Alchemist Mountains are mountains zen