I think a lot of texts we write tend to serve what (we assume) the readers want, so we prepare more to avoid "mistakes." Instead of writing down an argument, speaking (not reading) it is much more challenging, as it requires the person to formulate speech quickly and without interruption. In a fast world, it is unrealistic to spend too much time on arguments, thus to shorten our thinking time without compromising quality, such skill is essential.
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!