Yep - a very common view/philosophy outside the Valley. For whatever reason, that's not the culture at all in SV. Actually "vouching" for someone is still gated by people's reputation, but introductions are understood to be less of a personal 'I think this person is worth hiring' and more of a 'You are both working on something interesting in a similar area, I think you should talk' or commonly, 'This person has some very weird but interesting ideas about something I know you're interested in'.

Random example but I was working with an algae biofuel company during the cleantech boom and we were having analysis problems as the equipment we were using kept fouling due to the harsh desert conditions where our ponds were. I was at a birthday party and obliquely mentioned that issue to a friend who had asked how it was all going and before I knew it, he'd called his former coworker who'd founded a company that successfully launched similar equipment to Mars which was obviously not user-serviceable so was built to be extremely robust. There was no 'ask' from anyone involved and nobody got richer from the exchange, but it was just a random occasion to connect people who might find each other interesting that was completely common in my SV experience.