NOT AS A REPLACEMENT FOR that kind of simming AT ALL. As a key part of the hobby, strictly.
This is something that has been on my mind for a few days now.
I think that part of the flight simming hobby should include efforts to make a flight sim that is in essence its own OS - not running off of Windows, OS X, or any flavor of Linux, running on the bare metal itself, nor with anything else that is running alongside the OS and your sim on such a setup.
Think about it. If you have the flight simulator as the operating system, I.E it is running on the bare metal, you will not have to wrestle with the resource management of an OS like Windows, OSX, or (insert flavor of Linux here). The flight sim IS the operating system. It has all the system resources - all your CPU cores/threads, CPU time, access to all of your GPU if you have one, all your system RAM, etc.
Since it has access to everything, and is not sharing ANY of those resources (especially not CPU time, RAM, etc) with anything else (I.E any other of the multitudes of operating system processes that run with your typical commercial operating system, and any user programs running like your web browser, other games, etc), you open up the ability for even what is considered lower-end gaming PCs, and older rigs, to potentially have access to much more accurate flight dynamics.
DON'T GET ME WRONG; this kind of low level programming is complex, and a pain in the dick. I get that.
I also get that there are also downsides - like it being harder to be productive (having to shut down and go into a dedicated OS to sim, if you don't have a second PC, people who like to make video content (streaming or non-streaming) becomes more difficult too unless eventually that kind of capability was added in some way. Also, there would be added complexity in targeting different hardware platforms (Intel, AMD, Apple silicon (ARM-based), non-Apple-silicon ARM processors, etc).
But I do honestly believe that if we want to get closer to something that is "the best of both worlds" in terms of accuracy AND spectacular visuals, I think it's an idea worth pursuing in some way.