I agree with this, but I also think that comms should have the option of displaying "all posts by this user" on the entry page/recent page of a comm, ideally just after the username itself, something like:

Posted by: matgb (all posts)

I thinkk I could hack an S2 layer to do this with some thoguht (although I haven't touched S2 for a year so I'm rusty), but it would definitely be a good approach.