What I Don't Like about PBWiki

Anyone who has ever edited a Wiki on Wikipedia has had to learn "Wiki-code."  Not html, not WYSIWYG, it's is own...thing.  

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.