I don't understand your argument at all. I've made hundreds of songs in my life that I haven't shared with anyone and so have all other musicians I know. The act of creating is separate from finding or having an audience. In fact, I would say that the complete opposite of what you say is true.

And even so, music production has been a constant evolution of replacing prior technologies and making it easier to get into. It used to be gatekept by expensive hardware.