I read a book awhile back that goes into the synth phenom pretty deeply. Authored by Susan Rogers, who was Prince's recording engineer for several years. She went on to get her PhD in cognitive neuroscience and teaches at the Berklee School of Music. Titled "This is What it Sounds Like". It basically explains to you why you like the music that you like.
I'm paraphrasing big time, but she draws a parallel to what happened to visual arts when the camera was invented. Until that happened, all paintings were faithful reproductions of people, animals, landscapes, etc. They faithfully painted what they saw, not what they felt. The camera allowed people who could not paint, the ability to commercialize their art by expressing not so much what they saw, but what they felt. And synths allowed a similar transition in music. Even if you can't play a note on an analog instrument, you can still commercialize your art by expressing what you feel. And there is a market for that.