It was causing chaos, as everyone was just clicking on whatever the most recent threads were and posting in them, often irately. This is meant to section things off more, to enforce a bit more order. However, if you just want to see the newest threads in all categories, you just click latest.
There might be a way to set that as a default for your personal account, but I don't know how to do it. It is probably available in options. It seems like it would be.