Why is early and continuous socialization considered the most vital characteristic to address proactively in a Gordon Setter's development?

Answer

Because their reserved nature can turn into suspicion or shyness without exposure

Given their heritage, they are naturally reserved; if they are not properly introduced to a wide variety of people, sights, and environments during their critical socialization window, that reservation can easily tip into suspicion or shyness.

Why is early and continuous socialization considered the most vital characteristic to address proactively in a Gordon Setter's development?
Dogcharacteristicbreedgordon setter