I understand they are used as filter, but isn't result just completely random, since the first impressions are unlikely to yield very relevant information. Sinc

I understand they are used as filter, but isn't result just completely random, since the first impressions are unlikely to yield very relevant information. Since you cannot try all the potential partners anyway, why apply such a filter at all? Why not just inspect more thoroughly anybody who randomly falls your way? It may be just that we want to have a feeling of being in control.