dcl: The acronym FLRW may be familiar to some viewers, but I suspect that they are in a very small minority. From the level of sophistication I perceive in most viewers, I doubt that many even know what a metric is, much less the names or properties of any specific metrics. Although I am a physicist, I have not had occasion to encounter the FLRW metric in my work or even in my leisure reading. I am a novice where the more advanced aspects of astrophysics are concerned.