Some notes are unfindable sometimes on some clients Some clients support disparate and incompatible DM protocols Some clients handle some recommended application handlers, and some do not (e.g. open this link directly in your calendar app) I do not and will not have an exhaustive overview of all the app interaction permutations. However, this effort can and should be crowdsourced, and perhaps automated. The tetris nostr poster aims to help communicate the importance of playing nicely, and inform/motivate testers to share apps not playing nicely together.