[bayarearefugee]

> Why is CFB not overseen by the congress and is a separate agency without oversight?

The same reason the Fed itself isn't. Anything directly overseen by congress is or will quickly become inherently political.

Government functions better when some important aspects of it exist as much outside of politics as is possible. Of course the days of that being a thing are rapidly becoming a distant memory given the actions of the current administration in the US.