Even in a meritocracy, those making the decisions need some way to both gather and screen candidates. Properly utilized personal relationships (as opposed to nepotism style situations) can be a good way to do both.
Maybe Dropbox and Airbnb wouldn't have succeeded without those recommendations, but those recommendations could certainly have led to a MORE merit based process. When it comes to judging quality, it can sometime be hard to beat a personal opinion from someone you trust. That may narrow the field a little bit (nobody has personally experienced all the alternatives) but it may also improve your decision.
Maybe Dropbox and Airbnb wouldn't have succeeded without those recommendations, but those recommendations could certainly have led to a MORE merit based process. When it comes to judging quality, it can sometime be hard to beat a personal opinion from someone you trust. That may narrow the field a little bit (nobody has personally experienced all the alternatives) but it may also improve your decision.