So PB Wiki is better for use in classrooms because it does use WYSIWYG. (Among other reasons.)
But is it really all that difficult to allow more than one contributor to edit a page at the same time? The very nature of collaborative writing and Wiki's sort of demands it, no?
But no. Only one person at a time. Nevermind that I can be in the middle of writing something only to find out that someone has "stolen the lock" from me and that I can no longer save my entry.
I fail to see the point of that feature.