Good question.
I'm not sharing only one side of the story, just what I want to share. Just as I'm sure you and everyone here shares only what they want to share.
And please consider this if you would: if one person here shares literally EVERYTHING about their situation, how would there be space for the others?
Now, you might say that you're not talking about sharing literally everything in the true sense of the word everything, and that could be true, just share enough so that others will be able to understand. I think that's good. Yet, what would be the definition of "enough"? My definition may not be your definition and vice versa, barring the dictionary's version: "adequate for the want or need, sufficient for the purpose or to satisfy desire." (Dictionary.com).
So. What exactly is "enough" information for opinions to assist each other? It varies. I say then, that what we're doing is sharing information that is "enough" based on our own definition of what is sufficient, adequate. Such indicates, then, that we do not have to share all.