The two biggest things I miss is the feeling when leaving the runway and actually getting airborne. The other is when you are doing a crosswind landing and the wheels finally touch the runway. It is just not the same in a simulator.
My best friend went with his son-in-law to Texas for the son-in-law’s check ride in a simulator. (The son-in-law is a corporate pilot for a large corporation). After the check ride my best friend was asked if he wanted to “fly” the simulator. He said yes and for the next thirty minutes he “flew” a six million dollar simulator. At one point the person who was programming the simulator switched from a landing at JFK in New York to flying over the Alps in Switzerland. That is when my friend almost lost his “cookies” it was that real. I doubt that FS2020 will ever be that “real”. FWIW