No opinion on the model or product itself, but I remember reading a very early math or physics book (think like Euclid's elements or Newton's Principia from Hawking's Anthologies) and the proofs were laid out as a dialog between 2 people being critical of each others arguments. I always thought that was awesome. The point of a proof is to convince its reader, and before a lot of formality was created, they were literally laid out as a dialog where one person tried to convince the other.

I found it an effective and engaging mechanism and use it in my own head all the time.