That's all fine, but why isn't there a setting somewhere, where I can just knowingly choose "always use end-to-end encryption" at least? The way it's implement

That's all fine, but why isn't there a setting somewhere, where I can just knowingly choose "always use end-to-end encryption" at least? The way it's implemented now still makes it a pain/inconvenient thing to do when you want private conversations. So let's face it. Facebook just wants to get away with the minimum necessary to convey that it cares about privacy, while knowing that only 0.1% of the conversations will ever be encrypted this way.