> defeat the purpose of laptops (working without a power source)?

I think for most people that's not the purpose of a laptop:

  - 80% of the time people will work from a desk.
  - It may be a hot desk
  - They want to take calls with computer in front of them, but not from their desk (due to open plan offices)
  - A couple of times a month they need to take something with a keyboard into a vendor/client meeting/presentation