There is a name for this but I forget.
When a novel cultural element becomes so iconic that it establishes new norms, it appears to later generations as derivative, predictable, and unoriginal. Think of Sugalhill Gang, Die Hard, or Superman. Before Sherlock Holmes, there's no such thing as a detective novel or a crime procedural or a hero of deductive reasoning.
By now, we've seen mystery stories derived from Sherlock Holmes, remixed and refiltered thousands of times. But imagine how astonishing it would have been.