Actually one can book by selecting "Book Cheap Flights" above - there you'll find an updated calendar. But as certainly not everyone will decide to try other options than this obvious one directly on the front page it means mostly... a loss of money(!!!) for the carrier. Pretty large sums, presumably, especially if it takes a couple of days to fix it - who would bother now. How many flight tickets could have been sold by then?
Well, it's only about money, a trivial thing
. Unimportant really?