This is in the Wishes Feedback Snapshot, and is scheduled to be done this year.
That is linked to this post.
Item #9 in the post mentions this specific item.
After extensive testing, live AI traffic seems to be one of the most unreliable aspects of Microsoft Flight Simulator. It’s also underdeveloped in many ways, so I thought I’d collect my suggestions and add more that I saw from other users.
The principle is that AI traffic is extremely important for immersion. Many of us spend hundreds of dollars to have ultra-detailed airports, and then we find them populated with roughly-painted Frankenstein aircraft that immediately pull us out of the experie…