I don't think you're having a DUH moment. It seems much easier to me to have active threads on top, which is probably why most BB's are like this. I'm not sure why the panic over it. The stated downsides (people bumping for attention or old threads never dying) seem to be less of a concern than the downsides of the old format.
A lot of times a new reader will post to a thread farther down the page and be completely ignored, since we've all read those and are only looking at new subjects.
Oh well, I like it, different strokes for different folks.