[ianburrell]

Nobody should use Cat8 for anything ever. For 10Gbps, Cat6 and Cat6A are plenty for residential distances. If you need longer distances, use fiber. Cat8 can be used for 40Gbps, but should use fiber at those speeds.

Also, it is much harder to run smurf tubes when retrofitting house than when the walls are open. Same with pulling Cat8 or fiber.