It's intentionally designed this way. For a number of very important reasons.

1. It's more difficult to secure your property if it's secret than if it's hidden.

People will be able to tell if you have money, simply by how much money your posts are making. They won't need to have the next step verification of what's actually in your wallet.

Having everything transparent can actually secure your property better. If there is theft you know exactly what account it went to and would be able to call upon developers and witnesses to rectify it, and have verifiable proof of fraud.

1. Nothing is ever secret from everyone.

Hiding account balances only hides it from some people, not all people. It's a public blockchain, and it would be impossible to completely hide account balances. This creates a situation where some have knowledge others don't. This knowledge could be used for a number of nefarious purposes.

1. We're working towards a more open, transparent and abundant society.

This space has the ability to radically transform our society. A society where there is more transparency. Lack of transparency, especially financial, is at the root of our oligopolies. Building in anything less-transparent would be a devolution.

1. It's not the transparency that is the problem.

If you're concerned about extortion. We need better systems of returning funds to proper owners. Being able to petition the community in a decentralized manner to arbitrate disputes of fraud or extortion.

We need to keep evolving the system so that it can be a viable alternative to a world gone mad. Not bring it back to the literal dark ages of opaqueness.