Rumors I have heard consist of..
They, the devs at "A2A", pride themselves in putting out best quality and most realistic aircraft. They have since their onset. FSX/P3D were stable for the most part however, in MSFS, it's much like hitting a moving target. With the SDK and metrics rapidly changing from update to update with Asobo and the some of their dev teams, it is much harder to produce a top quality and realistic aircraft. Rumours...