My TV downstairs isn't being moved whilst we are here (it's surrounded by a painted contrast coloured border and hung on the wall with half an av stockists supply of cable buried behind it) - but when my daughter moves out of a cot into a single bed and therefore different bedroom and my wife's study moves into the guest room I'd have a lot of outlet plates in really stupid positions all over the walls - the way I have done it I can just cut the connectors off and poke the cables back down under the floor, and/or have the floorboards up and pull them back or extend to somewhere else. Like I said, in the next house I'll do it all properly as I'll be planning to be there longer. The point is it's not technically inferior to do it all this way, and can still look neat if it's all hidden by what it's supplying anyway.