It was a bit unnerving the first time it happened but you have access to so many people like that and you are around it daily.
You constantly find out about new things from your buddy over at the other company who tells you about something they are working on that is a completely new product.
Not to mention when something hits mainstream outside SV its aging in SV and soon will likely be obsolete
Example you might not know this but k8s is googles borg lite and everyone who has been around the valley has ran into someone who worked on it for years.
You simply don't have that experience outside SV...Not to mention things considered common knowledge in SV isnt common outside... eg I still have to explain to people why ITIL doesnt work with Agile DevOps ever since I left.