I would say this is not universal. For some, the written word is the native "tongue", conveying the actual, intended meaning. The written word allows the speaker the opportunity to evaluate and revise their language to match their intent, and the listener the opportunity to re-evaluate previously transmitted thoughts.
The oral variant is dependent on the real-time aptitude of the speaker to articulate their thoughts and message, and for the listener to extract that meaning from the same. For those of us handicapped in these traits, the spoken word is the poor facsimile for actual (written) communication.