I think there are several reasons to keep holdings private. Certain journalists and / or whistle blowers could be tracked simply by watching accounts. These are people that really need many of the aspects of this platform and I think it should be capable of protecting them.

Some people would like to keep income private to avoid taxes from their governments. I think there is nothing wrong with that. I would like to see platforms like this dissolve governments and I'm pretty confident they will.

There are likely plenty of unforeseen reasons as well. I appreciate transparency, but with blockchain tech, we can have that with privacy. That is its killer feature. We should use that.