Presidential libraries do provide a repository of information that can be used for historical research. But they also serve other functions, both positive & negative, as noted.
It would make more sense for everything to be stored in Washington so that researchers wouldn't have to travel all across the country. If it were under the authority of the National Archived or Library of Congress, it might should some of the problems associated with regional centers but we also know all to well how politicized every branch of the government can be.
That may be Joe Biden's only true accomplishment: making clear to everyone how corrupt, incompetent, & tyrannical our government can be. One only needs to open one's eyes to see it.
“Incline my heart to your testimonies, and not to selfish gain!”
Psalm 119:36