AAA titles are one thing. There are other more niece use cases that will pretty much consume as much video hardware as you want to throw at them. DCS World being the one I'm interested in, but also Flight Simulator 2020. MS Flight Sim has always made current hardware seem inadequate. I understand 2020 is no exception with a 2080Ti barely able to run on High settings and coming nowhere near 60fps.
As a pilot myself, all I can say is FS 2020 is stunning, it's by far the best PC simulator I've used, although it's been two or three years since I last tried Prepar3d or XPlane.
I run MS FS at 4K at a fairly consistent 40fps in Ultra on an RTX-2080 Ti with an i7-8700k. Note that I use it to maintain currency, not really for sightseeing, although it must be stated that the smoothness and realism I've found so far to be very acceptable. There's a fair bit of discussion that you don't really need 60fps+ for a flight simulator, and IME I'd agree with that, although I can see that it might sound counter intuitive.
My box is a mini-ITX build, using an Asrock Z370 Gaming ITX/ac, with 32GB 3000MHz DDR4 and a 2TB M.2 NVMe SSD. Except for the 2080Ti and case, this was my old lab/bench development PC, and I upgraded it specifically to use with FS 2020 back in April when I had some Covid time on my hands.
The case is a Sliger SM560 3-GPU slot (duh, I hadn't realised the 2080 Ti I'd bought was a 3 slotter!) with ventilated panels all round. Avoid inadvertently placing liquids on top of it! Otherwise this well ventilated case is the best ITX enclosure for thermals I've ever encountered despite its diminutive 11 litre size.
Two Noctua 120mm fans are in the base On the CPU I have a frankenstein combo of a Cooltek LP53 cooler with another Noctua 120mm fan sitting directly on top of it: the overreach of the fan cools both the CPU and the motherboard.
PSU is a SilverStone SST-SW700-G. An earlier Corsair SF750 that I installed blew its magic smoke when in standby, taking a circuit breaker with it. The i7-8700k is stock, with no IHS modifications.
With no overclocking, it runs AIDA64 at 75 deg C with a slight -100mV offset undervolt. As with any mini ITX build, it's not great for overclocking, thermals get out of control rapidly, so I leave it running at stock apart from the undervolting.
To complete the setup, I have a Honeycomb yoke, Saitek/Logitech throttle quadrant, and Thrustmaster T.Flight Rudder Pedals. As a pilot, I find that having realistic controls is key for me: trying to land with keyboard and mouse is neither fun nor realistic.