I have never participated in a we-write for several reasons. The main reason being social anxiety; there is something daunting about collaborations. The first collaboration I have done (and the only one) was in December or so, and it was a poetry collaboration. I do understand that time-wise, a freewrite would be shorter, however, there is still a kind of co-dependency which I am not as comfortable with. That sort of thing that would inhibit me from freewriting and be too-critical before writing, which would defeat the purpose!