The requirements are the things that people can think of ahead of time, and they always contain glaring problems. It is inevitable that someone will have a "shower epiphany" at some point and share it with their colleagues. When these discussions happen in person then there's a discussion about how important it is, whether it rises to the level of an ECR, NCR, or other documentation mechanism, and what to do about it next. I have seen myself that when this happens in Teams chats that _usually_ someone from PMO intervenes immediately and says that we don't have the budget to address the issue and don't you dare spend any more time on it.