I read it a long time ago, there are so many layered subcultural references it can be hard to get through. I remember enjoying his earlier short novel, “The Crying of Lot 49” a lot more, with its theme of linked subcultures. Gravity’s Rainbow seems to be an archetypal 1960s work, I doubt a new author would be able to get something like that published in today’s market.
Pynchon worked in the aerospace and missile industry in southern California, so there are a lot of references to that, including the title which refers to the parabolic arc of a launched ICBM. Some of his earliest writing was for classified missile industry journals, and I think there were some completist Pynchon collectors who tried to obtain copies of those early (very dry and technical) non-fiction articles and nearly got arrested.
Pynchon is one of those writers who has always avoided the spotlight and rarely gives interviews, like Don DeLillo and J.D. Salinger, which added to his mystique. I remember when he won the National Book Award (or somesuch), he hired the eccentric comedian Professor Irwin Corey to accept on his behalf and I think pretend to be Pynchon. He came out with a noir mystery a few years back but I haven’t read it.