They are incredibly valuable in their own right, without the need for derivative values like “what they tell us about halacha”. They a direct link to our great-great-grand antecedents.
They also have the potential to teach us an incredible amount about Judaism during bayis sheini – if we are willing to listen. For example, IMO two of the above posts completely miss the point on two of the discoveries.
The “tehilla l’david” with the passuk for nun is not so much a question of who was right vs. who was wrong. It puts R’ Yochanan’s statement into context – he’s not just rationalizing an oddity; he’s explaining why his choice of the no-nun version is better.
And the 364 day calendar is mind-blowing – it completely redefines how we think about the interactions between the tzedokim and the chachamim regarding the calendar. Of course, we are not tzedokim so we don’t care what they thought was the correct day of pesach, but now we know what they were trying to get when they manipulated the beis din to declare rosh chodesh. (It also could explain several discrepancies in the New Testament regarding the death of yoshko and its relationship to Pesach, but I suspect The Yeshiva World is less than interested.)