I prefer it this way ... if I've been "following" a thread with quite a few pages I'd rather see the most recent posts come up when I click on it rather than having to scroll all the way through to the last post.
Edited to say: In my working days I learned to file this way also ... the most current invoices were filed in the front of the folders so you didn't have to go all the way to the back to find what you were looking for. I've talked to a lot of folks who find that way of filing odd but I even have my file cabinets at home set up like that now ... current papers, invoices forward in the front.