That sounds like it would be a pretty simple program [...] but I don’t know anything about programming

As a programmer, that phrase tends to raise my blood pressure. But it depends on how they structure their data but since all the elements are already related, it should be easy to query them all together. I bet they've abandoned it more because the query UI is a bit dense for most. But nothing that could be replaced with a simple textbox that could take any combination of cast/crew/titles and find anything that matches the combination. But they might need to add some specific indexing that would use up additional resources.