I don't think what you're saying is 100% true. When I was looking for a gf I asked my friends if they knew someone who I might like. I also tried online dating.

I don't think what you're saying is 100% true. When I was looking for a gf I asked my friends if they knew someone who I might like. I also tried online dating. Online dating ended up working eventually after a lot of trial and error but it would have but a lot easier if a friend could have given me an introduction to a validated person. Would a person a friend introduced be the optimal person for me? Maybe not, but it's someone I likely could have been with quickly who would probably have been at least pretty good. Online dating meanwhile is an awful slog even if it sometimes produces a better person at the end. The exact same thing applies with hiring, except the stakes are higher. I can date someone for a month or two, decide I don't like them, and move on. You can't do that with hiring.