The process of producing speech is the result of the direct or slightly indirect activity of billions of neurons. That activity, in turn, is the result of inputs that take into account the strength of trillions of dendritic connections which encode (in a lossy fashion) the history of a persons experience.
Speech is compressive and lossy. You do not communicate the full state of your system or even a small portion thereof when you use speech. You have a limited vocabulary whose meanings do not map one-to-one in the mind of any other person who hears you speak. So not only are there multiple limitations on the output side of the channel, there are limitations on the receiving side as well.
This is why effective communication is so hard! As the sender you don't have full introspective access to the contents of your brain, so you can't even know what the full message is you're trying to send. As the receiver you're operating on a highly compressed message without a fully shared codec.
So whatever the feeling of "I'm being direct" or "I'm being clear" is, it is almost certainly itself faulty. We're not built for that and language isn't either.