Unfortunately for me, I started developing really bad RSI around January of last year, and typing has been incredibly painful. In the past I would have discussed things using whiteboards, sitting down side-by-side with code, etc.; these are all very hard to do if typing causes pain.

Interactive sessions are also very helpful, as there are so many assumptions and background material baked into things that often take a long time to unwind. Being able to gauge on-the-fly if the audience understands can save tons of time and confusion.

I've got 17 years of domain experience across 3 companies in the industry; there's no way I'm going to write all that down in my docs.