This sounds to me like a lot people who can't touch the right spot.
I’m a tech support analyst, and a large percentage of the population shouldn’t be allowed to go near a computer. No matter how simple something it, you’ll always find a “simpler” person...just sayin.
Add in the hackability and closed source software and you'll see the voting process is too important for too broad an audience to be using these horrible Deibold or Sequoia and similar machines.
Here's a video show how, even after re-calibration, the machine still picked the wrong candidates. YouTube
Optical scan is the best of both worlds with fast accurate counting and easy verifiability by hand.