This is why I would rather have profit hungry corporations manage things than governments. Because with government there's always a legion of people rushing to excuse and explain away even the most serious examples of ineptitude and mismanagement.
Would you accept it if Facebook or Google let people login to user accounts via signed letter? So why is a signature enough for a search warrant?
A signature is not an acceptable method of authentication in 2023 for important documents. I don't see how that's not obvious.