Today I listened to the album The Rise and Fall of Ziggy Stardust for the first time. It was released in 1972. Is it really that bewildering to you that not everyone has seen everything that exists already?
You also have to try and shed yourself of the intervening 40 years of musical and social development, to try and get a sense of why this album created such a buzz when it was released for the first time (context - I'm about 30 years old, so I wasn't even born until 10 years after this was released, and wasn't socially/musically aware until about 25 years after it came out.)