From a practical point of view the TV is normally mounted in the footboard which for most people will be in the centre of the room ie.Not against any internal or external walls.
So if your going to watch TV you will need a aerial running to it, so nice long length of cable trailing round the room, having it connected to a DVD player?
The DVD player will normally sit in a section underneath the main bed so in order to change discs use the remote will involve you hanging over the side of the bed,
Want Sky connected , no problem see the first 2 points.
Only time I saw TV beds in my job as a SKY engineer was in the Chav houses where they generally live in bed, for me they solve a problem that doesn’t exist, and they look sh!t.