Allow me to digress with a personal reminiscence. I sometimes publish in a branch of philosophy called phenomenology. After publishing my first paper in this subject, I felt deeply hurt when, at a meeting of the Society for Phenomenology and Existential Philosophy, I was rudely told in no uncertain terms that everything I wrote in my paper was well known. This scenario occurred more than once, and I was eventually forced to reconsider my publishing standards in phenomenology. It so happens that the fundamental treatises of phenomenology are written in thick, heavy, philosophical German.
Tradition demands that no examples ever be given of what one is talking about.
One day I decided, not without serious misgivings, to publish a paper that was essentially an updating of some paragraphs from a book by Edmund Husserl, with a few examples added. While I was waiting for the worst at the next meeting of the Society for Phenomenology and Existential Philosophy, a prominent phenomenologist rushed towards me with a smile on his face. He was full of praise for my paper, and he strongly encouraged me to further develop the novel and original ideas presented in it. What the number theorist did not realize is that other mathematicians, even the very best, also rely on a few tricks which they use over and over. The second volume of Hilbert's collected papers contains Hilbert's papers in invariant theory.