I’m a real pilot.
My perspective: FS2020 really is the best simulator ever made (2024…maybe when they fix all the broken stuff). Others might be more accurate “by the numbers,” but the total package of 2020 is the closest to flying a real airplane. Most of the default airplanes are inaccurate in one way or another, and yes, other sims have a higher average systems fidelity. But the combination of systems, flight dynamics, environment, visuals, and, for lack of a better word, “feel”, is highest in FS2020. Get something like the Fenix or the A2A Comanche and the systems/flight dynamics are so close to the real thing you really can train on the sim.
Procedural accuracy (such as ATC and ops) remains very poor. I am constantly worried that bad procedural habits I pick up from the sim will bleed over into the real world, but so far that hasn’t happened.
The biggest remaining difference is that ephemeral “feel.” Flying a plane is a kinesthetic experience. Most pilots seem to agree that flying real aircraft is easier than flying sim aircraft, because you have your inner ears, your peripheral vision, your situational awareness, the seat of your pants. None of that works in the sim. Even something like A2A, which does a really great job of simulating the way you, the pilot, move as an airplane moves, is fundamentally constrained by the fact that you’re still sitting in a chair looking at a screen in a room somewhere.
Example: one of the planes I fly, a Bristell NG5, weighs only 800 pounds empty. When I first started flying it, I was trying to fly it like a sim aircraft, by visuals and instruments. I got by, but it felt squirrely and even the minor gusts felt like a hurricane. The plane is so light that you fly over a parking lot at 2,000’ and get a 500fpm climb. As time passed, I realized I had “learned” the plane and there was a whole layer of kinesthetic reaction and control I was using to fly the plane before even using my eyes to look out the window or down at the instruments. You learn which gusts you need to react to and which the plane will ride out, you’re making a thousand tiny, almost imperceptible corrections every minute, and there’s just nothing in the sim to compare to that - turbulence in the sim feels like Star Trek shakeycam by comparison.
I’m honestly not sure how much better it can get, without us all getting full-motion simulators in our basements. Everything else (except procedures, which still has so far to go) is so close it’s mind-boggling.