A large problem is missing more real world aircraft. There’s so many varieties of aircraft that make up air traffic that aren’t in the sim. I’d really love for them to add some more of the most widely used aircraft, even if just as AI to flesh it out more.
Hell, I’d even just take an improvement where the current AI doesn’t immediately disappear after landing, or when they do stick around, exit the runway when they should rather then running to the end preventing other aircraft landing. Maybe also fixing the rotating landing gear bug on them or increase the draw distance of their landing gear. There’s a lot to do basically.