There are a lot of days when two-day lending offers completely swarm everything else, and somebody looking to borrow a large amount for 30 days, can only see a few offers, not the whole picture. Having a filter would not harm anybody. The options could be e.g. "all", "2-7 days" and "8-30 days". In that way, those who like the current view, could continue using it. From Bitfinex's point of view, this would be beneficial, as it helps connecting borrowers with lenders. There would still be just one orderbook, but alternative ways to view it.