1. Organizing knowledge. Too often I've seen a lot of well-written and well-intended information thrown into a shared cloud drive or wiki to rot and grow stale. You end up with multiple, sometimes contradicting documents about the same topic, finding what you're looking for is difficult, and before you know it people revert to tribal knowledge and slack DMs to find out what they need.
2. A writing culture can penalize and demoralize non-native speakers whose writing skills may not be as strong as their peers. I've worked with brilliant individuals who felt like they're perceived as "stupid" because their language skills weren't as polished.