Camera
That has been quite a topic of debate.
But, some places don't allow cameras, so better to have a device where the camera is an option. And I think work is being done to allow that option.
Quite an exciting time for opensource as all the new devices hit the market, finally we are getting to a computing panacea, and we can ssh into machines from wherever we are, that to me is the big boon of opensource devices.
Along with the ability to just get creative with the uses, something that proprietary systems have made so incredibly awkward.