Yes, it is true that the more of ourselves that we share, the greater we are exposed to potential harm, if even unintentional. However, we also expose ourselves to a greater potential of good, which outweighs the potential harm.
Sharing personal details is nothing more than growing knowledge. Are you really claiming that there is a "proper" growth rate to such knowledge growth?
It's not that there should be a particular rate (for any given couple in specific circumstances, there is a right rate, though). Rather, I'm against discontinuous jumps.
And so, against:
- declaring boyfriend/girlfriend status
- declaring patient/psychologist status
and any other sort of declaring a personal relationship that didn't exist the moment before the declaration. And (to a lesser degree) this applies to telling people intimate details early -- acting on a fantasty relationship. In all these cases of discotinuous jumps, the people sorta creation a relationship out of thin air, then try to act like it exists. Which is dangerous (highly conducive to making mistakes) and doesn't actually help further any real relationship.