This is an honest to goodness question that might sound negative: How do you decide when you have enough rear lights?

Full disclosure: My viewpoint has always been that there is a point where adding light/reflectors/whatever isn't going to do a thing. I see similar patterns with motorcycles lately. They get those flashing brake lights (maybe it's an Illinois thing?). I believe that if the driver didn't already see you, those flashing lights aren't going to change a thing. And that's also how I feel about adding multiple rear facing lights on a bike.

Help convert me, what am I missing?