In MP 1.3.40 HITL simulation page was replaced with SITL simulation page. Is HITL simulation with X-Plane or FlightGear abandoned in MP?
I looked into this too just about a week ago. I read that HITL has a lag with the new EKF engine. Something like after 3.3 it doesnt work well. Kind of a shame but I will be looking into SITL some more.