The tagged MARC system employs a data model that was designed to be used as a protocol for transferring data by linear tape or in single files. As such, it is structurally unsuitable to be employed in data models created for relational or entity database systems. The analytical and differential structure of MARC makes it unwieldy and complex for untrained users to use and query. Respect for sources, of course, is a laudable attribute. For the former, a MARC record for one book will be the substantially similar to the record for every other example of that book.
MARC records are generic.
It makes good logical sense to apply the work of one cataloguer to the holdings of other collections. With the exception of fine-arts prints, books, and other multiples, museum objects tend to be singular items. Museums catalogue unique objects, made and existing under unique conditions, bearing unique histories. While published books tend to be defined by the information on their title page or within their covers, museum objects are almost always defined and catalogued as a result of a series of attestations and opinions that are not attributes of the object qua object, but rather of the scholarly and other changing worlds that surround the object. Museum objects are defined and understood by virtue of their gestalt.