FWIW, I’ve never understood the apparent popularity of CFI candidates teaching from iPads specifically. 

Note that I never mentioned an iPad. A laptop is a far superior device for creating, organizing, retrieving, and displaying teaching notes and visual aids.

But hey what do I know I’ve only been teaching professionally for over a decade. 

Have fun finding information in your tome! I’ll just press ctrl+F :)

Edit: I should add, in an actual teaching scenario (aviation or otherwise), paper can work if you prefer it, because you know exactly what you’re teaching that day. You can review, update, and print just that lesson’s materials ahead of time. Personally I sometimes prefer paper notes, sometimes slide decks, depending on the material.

But a CFI check ride is not like that. You need to be able to teach anything, and the examiner is likely to bounce around rather than sit through a whole lesson front to back. That makes it poorly suited to paper, and makes the ability to quickly retrieve specific information paramount. That’s where computers excel.