For some simmers, I don't think there is a limit. Was using XP12 and noticed the manifold pressure dropped to atmosphere when the engine stopped just like in real life. Appreciated the detail. Ideally every button and dial works like real life. Textures and materials are convincing enough for complete immersion.
You're doing great work. I've been following your posts on X-Plane.org as well. I really hope you make it to a first release. I modelled a V35, completed the outside only + flight model. It was enough for me to understand the incredible amount of work required for a fully functional high def airplane.