The point of a laptop is it’s portable, which is great when you have a full battery and you can wander around as you wish. Every so often though you’ll have to sit down and do a bit of work and charge the laptop at the same time. This doesn’t mean you want to sit on top of a plug socket, it’s nice to still be able to sit on the sofa a few feet away without having to wheel out a massive extension lead to plug in your piddly 1 foot of laptop charger cable.