The physical book is a lot easier to carry to different kinds of body positions on varying furniture, walk around with, etc. I suppose a tap on the iPad screen

The physical book is a lot easier to carry to different kinds of body positions on varying furniture, walk around with, etc. I suppose a tap on the iPad screen is probably technically the least effort, but I don’t find flipping book pages to be a hardship, and being able to write in the book margins, organize books on the shelf, etc. is nice. YMMV. The most stressful aspect of using a typical workstation computer to read a long document is probably sitting in a typical office chair. You could compensate for that with a standing desk, but the book is still nicer IMO. > It is so good, I don't know how to explain. This is mostly because a 2D mouse + keyboard is quite a poor tool for navigating in 3 dimensions. A multitouch screen could conceivably be decent with a well-designed interface, but the common ones aren’t great.