I have heard that a lot over the years, especially in the Design Thinking stuff that comes from the Stanford d School. The purpose is to encourage the free flow of ideas and not risk people being afraid to share their ideas because they might not be good enough. Once all of the ideas are on the table, they can be critically evaluated. This can be taken to an extreme that is just a waste of time. I’ve been in meetings where there was someone who took advantage of this to just spout nonsense.