I used to be heavely involved in MSFS and setup RealAir Simulations with the flight dynamics Guru (Rob Young)
The flight dynamics engine in MSFS is rubbish adjust one parameter and everyrthing else goes out of kilter.
Rob young did some amazing things with RealAir Simulations in getting half decent aerodynamics.
He described the way aircraft handled as a puppet on a string.
They are still best on autopilot for IFR training.
One of the best sims although now bust and antiquated was flight unlimited which had a realism not found in MSFS.
I actually found the sim to be very helpful for keeping a pilot up to speed but as many have said you need a lot of addons aircraft and visuals.
As an addendum work was being done on allowing a genuine instructor to enter your cockpit online and instruct dont know where that got to as i packed it all in several years ago. That would have been a major breakthrough in home sims.
Pace