If you read David Daniels's 2 books on Sinaiticus, you'll see why all the fuss.
Daniels, with Avery's help and "research," has posited the ridiculous theory that the existence of Sinaiticus is nothing but a grand scheme to dethrone the TR, overthrow the KJV, and get the world to use a one world Bible for the New world order under the antichrist. The lavish scheme comes complete with Jesuits, the Vatican, complicit scholars, a forger named Simonides, etc.
That's why they've been trying with all their might to prove it was written in the 19th century......to justify their conspiracy theories.