It's important to note how restricted all of this wealth of knowledge is. They could allow anyone with curiosity or interest to research for their own reasons, but they don't. I was actually curious if this behavior would change under the new Pope.
Qualified scholars from institutions of higher education
pursuing scientific researches, with an adequate knowledge
of archival research, could apply for an entry card.
Scholars need an introductory letter by either a recognized
institute of research or by a suitably qualified person in
the field of historical research. Applicants need to specify
their personal data (name, address etc.) as well as the
purpose of their research. Undergraduate students are not
admitted.
I have mixed feelings because if they wanted to be open they would just become open. Given all their restrictions it really comes off as if they want to "control the message" regarding anything they have collected over the centuries.