As an anecdote, somebody at my workplace has just spent a day tearing their hair out trying to figure out how to get our selenium tests running automatically on a headless machine, because the resolution flat refused to go above 1024x768. Even then, they're slow and heavyweight.

A very fast browser not tied to a graphical display with the bonus of being able to put error screenshots into all of our existing tooling could actually be quite beneficial here, whether the text is character-identical every time or not.