I don't really understand the appeal of Hollow Knight. Like don't get me wrong, I loved it, but having played lots of other Metroidvanias, including the classic Symphony of the Night, it didn't rock my world or reshape the paradigm that existed. It is a good Metroidvania alongside others.
Is the appeal a kind of generational thing—people who hadn't played a lot of those predecessors but experienced this one first?
Edit: I appreciate the responses and everyone's unique perspective!