The rooms are certainly impressive.
The rarity and beauty of the books is certainly impressive.
What's not impressive is the loss of the ability of these books to ever teach anyone anything again. They were not acquired to teach anyone anything, they were acquired to be displayed. They are less antique cookware or antique musical instruments, which can at least still show us how people played music and cooked even if they are no longer used for the purpose. they are far less useful that antique works of art, which can at still be viewed and appreciated.
That the books are behind bars is grimly symbolic. These books are imprisoned, and I found it a sad place.