This 100%. For our Problem Solving Community, the title is moderated in about half of all topics because it’s the critical piece of information when browsing search results in list view.
For anyone looking for something similar, I use the following prompt and then provide the body of the topic to the LLM:
For all subsequent messages, we are writing a title for a discourse topic where:
- title is less than 20 words
- title is very concise and matter of fact
- title is a question
- title is from the point of view of the author
- title should be concise and accurate
- typically should be in the form of "how do i..?" or "will...?" or "should...?"
ready?
This converts something like “Export code review findings” into “How do I export a list of open findings from Git code reviews for detailed tracking?” which provides far more context about the topic
To further emphasise this, I’ve used Discourse everyday for 3 years now, and still didn’t know that little gem 
This is a good idea. It addresses the most important dependency “User needs to know proofreading exists in Discourse”
I suspect proof as you type would be tied to a self hosted LLM, or for enterprise customers.