OP's inability to grasp something is entirely their problem, not Facebook's. I object when privacy is taken from me. I will, however, give up a degree of privacy in exchange for convenience. That is informed consent.

If one's news feed is full of gossipy rubbish and stuff they aren't interested in, then one either need to learn how to customise one's feed (easy) or get better friends. Facebook make it pretty damn easy to do the former.

Facebook is a content sharing platform and one's friends are making the content. If the content is rubbish, that says more about the people involved than it says about Facebook.