It's not difficult to see how a computer - especially with a huge database - could do very well at differential diagnosis. It would require the correct inputs,

It's not difficult to see how a computer - especially with a huge database - could do very well at differential diagnosis. It would require the correct inputs, but its advantages are very clear even with fairly simple algorithms. Theranos hand-waved several huge problems with their approach by claiming proprietary magic. What they tried to do is probably impossible. So, big difference.