That’s fascinating to me. Isn’t much of the point of NYC’s boroughs (i.e. purely-administrative divisions of a legally-conglomerated city) that infrastructure that makes sense to centralize/share between boroughs, can be centralized/shared, much more practically than it can under separate city corporations?
Why, then, does the distinction in library systems remain? Is it advantageous somehow? (Certainly not for the people wanting to check out a book via inter-branch loan.)