Staying hidden is also an aspect of life that all wish to maintain. Hiding, being hidden or trying to hide. These are all things that introduce uncertainty to your peers, opponents and other surroundings.
Trust is not easily established, we are not yet close to a trustless world either and so maintaining the concept of hiding through secrets and anonymity are crucial to prevent undue exposure. In relationships, purposely hiding and revealing are also forms of bargaining chips as mutual trust is discovered.
How much we hide depends on our circumstances. But I would say that many choose to hide as much as possible from the very outset to protect themselves, it is a form of defence that could be said to be part of human nature. Hide and stay hidden.