That’s a fair point, but good technical writing is a skill in of itself. Just like having dedicated UX SMEs on a team improves a product, technical writers do the same, especially for complex systems.

It’s not that a software engineer isn’t capable of writing, but more that it’s not their primary responsibility.

I also anecdotally believe that having people in roles like this who are accountable for documentation, design, etc improve the overall product as they provide another layer of review.