Writing is used primarily to document thought – either for individual posterity or to be shared with another or many. It used to be an act bordering on the sacred. Not only did you need to be one of the privileged few that could actually produce recordable script, you had to have the means to do it. Paper had to be handmade. Whether it be papyrus or vellum etc. It was a delicate and time consuming process. Not to mention the writing utensil itself. Quills had to be cut, ink made. In short, if you had something to record, you better be sure it was important.
If you were careless and made an error it was nearly impossible to correct without evidence of your folly being left behind. Whether that be a spilled ink stain, or an area where the vellum had to be scraped clean. Even in modern time, if you messed up with an ink pen or typewriter you had to smear white out on it. There was always a trace of your inattention to perfection.
Nowadays you can record thought with a few key strokes while lying in bed half awake in the middle of the night. If you make a mistake you hit a single backspace key which takes less than half a second. Never in the history of the world have we had greater ease with which to express our thoughts and yet the vast majority of what is produced is thoughtless.