That's a very nice GPU, and with careful selection of the other components you will end up with a cracking gaming PC.
You don't mention if you are already using it, but with regard to MSFS I have 1,000 flying hours in the simulator and have tweaked my PC build and game settings over the last couple of years to optimise it as far as possible. For MSFS (and I understand most other simulators), CPU performance is just as critical, if not more so than the GPU. Your choice of the AMD 5800X3D looks good due to the size of the L3 cache, which has a beneficial effect on MSFS performance and despite it's relatively modest price, this CPU performs as well or better than most 12th or 13th gen intel chips with this simulator. The only thing I would suggest is that if possible you might look to one of the new AM5 socket CPU's which have the X3D architecture like the 7900X3D or 7950X3D. These are currently pricey, but I understand that 5 and 7 range X3D chips are soon to be released. This would mean you have the best possible performance as well as some measure of future-proofing, since there will be no further developments for the AM4 socket. If you don't maximise the CPU performance for MSFS, you will be forever frustrated with 'mainthread limited,' and your superb GPU will be idling rather than utilised to the full. Moving to the AM5 socket would however mean a B650 or an X670 motherboard, and these only use DDR5 RAM
On the other component choices, specifically with regard to MSFS: Assuming you go with the 5800X3D / X570S combo, I have similar Corsair DDR4 ram and so far it has not caused me any reliability or performance issues. Definitely go with 32GB.
The Samsung M2 MVmE drive will be perfect whichever mobo you choose, and will minimise the loading time.
The X3D CPU's run hot, and while the noctua cooler mentioned is well regarded, I would personally go for a 280mm or 360mm liquid cooler.
From personal experience, Corsair fans are NOISY, and they are not the most effective air-movers either. Just like yours will need to, my pc shifts A LOT of air when using MSFS. There isn't much that can be done about the GPU, but all of my case and cooler fans have been replaced with be quiet! fans, and it no longer sounds like a jet engine on the edge of my desk. I would therefore very strongly recommend a be quiet! case, PSU and cpu cooler, or failing that just buy their fans to replace the existing Corsair ones.
If you don't have something already, don't forget a decent joystick or yoke, along with a throttle quadrant and some rudder pedals. I have had various controllers from Logitech and Thrustmaster, and have now moved on to VKB gear which I much prefer the quality and feel of in use.