Chekhov’s gun (Russian: Чеховское ружьё) is a dramatic principle that states that every element in a story must be necessary, and irrelevant elements should be removed.
Elements should not appear to make “false promises” by never coming into play. The statement is recorded in letters by Anton Chekhov several times, with some variation:via Wikipedia
A few friends of mine were talking about “Chekhov’s Gun” and the parallel principle(s) when it comes to product design & development; essentially, if you’re going to spend the time building (or adding) a feature then you must make sure that it is absolutely
necessary, otherwise it might be understood as a “false promise,” sometimes intentional but more often unintentional.