All of this is why I had high hopes for LiFi - completely blocked by walls, zero crosstalk, allegedly great performance within each room, and you can run it through lights that you wanted to have anyways. Obviously there are trade-offs, but it really did look like a great solution to a lot of these problems. Unfortunately, I suspect that 1. the trade-offs really didn't hurt, and 2. Wi-Fi is already utterly pervasive and it's almost impossible to get a second standard that's not backwards compatible to that.