That's something that a lot of people don't seem to figure out yet because in as much as we all live wide apart, the same thing almost happens all over.
San Francisco is showed off in the game a lot and I can't wait to see more of it. You can read up more here...
https://screenrant.com/horizon-forbidden-west-game-real-life-locations/
It's definitely going to do you a lot of better to have less backlog on the GTA games to play. But I'm sure you can be able to finish before the release of GTA 6.