I think no artist can claim to have any access to the truth or an authentic version of an event. But obviously they have slightly better means at their disposal because they have their art to energize whatever it is they're trying to write about. They have music.
I don't think immortality is necessarily the key to understanding the world. You have to be careful with what you think you're achieving. I'm all for science discovering amazing and fantastic things about our world but I think the motivations behind it are slightly askew.
Writing is a solitary occupation. Family friends and society are the natural enemies of the writer. He must be alone uninterrupted and slightly savage if he is to sustain and complete an undertaking.
At my age you don't go into fatherhood lightly.