My own feeling is that the separation of accidents from the Private Flying forum psychologically suggests that they are separate subjects...you can enjoy yourself exchanging views and stories in the sunny world of incident-free GA or you can head over to the dark side in the Accidents thread if you're a bit morbid.
I have always enjoyed the Private Flying forum because of the good mixture of subjects covered, including a substantial helping of "keeping yourself out of trouble" and some interesting discussions of incidents. I think fewer people will visit an Accidents only thread.
To me anyway, it feels like a backward step.
EDITED to say that
The Old Fat One posted as I was typing and I agree that accident discussions should be
up close and personal in every users face