A lot of that is confirmation bias. They spent out on an expensive 4K display and have to mentally justify it to themselves. Youll see maybe a handful of people here on these forums who are just stubbornly "ZOMG 4K SO MUCH BETTAR CANT EBER GO BACK" - most of us will aknowledge that 1440p is the sweet spot.
1440p is a big step up over 1080p. At average desk sitting distance - about 30" - on anything over a 21" display you can still see individual pixels. At 1440p, at 27" and lower (there are a few 1440p 24" panels still out there) you cant. Is 4K 'even sharper'? Sure. But since you already cant see the pixels on 1440p, its not nearly as big of u visual upgrade, but it is a HUGE performance hog. Given how much better high-refresh looks, given the choice between 4K and barely-making-over-60fps, and 1440p and 120+fps, most people will go with 1440p/120+.
Having experienced side-by-side 4K vs 1440p (both in 27", which is another thing - in a lot of cases good 4K displays are 32", meaning a lot of the additional pixel density you get from going to 4k is lost because the display is bigger), while i can tell which one is 4K, its not night and day and not worth losing framerate. Once you get used to high refresh rate (at ANY resolution) youll never want to go back to just 60fps or lower.
Developers often over-shoot on recomended settings and the like because its easier than trying to nail it exactly. The primary difference between i9s and i7s in the current generation is just base clock speed. And its barely higher. The i9s CAN have an extra 2 cores but that isn't going to help with gaming. Not for the workable life of the machine. (Edit: and actually, with 11-series CPUs, they cant; Tiger Lake doesn't do 10 or 12 core chips).
Yeah no worries, i fully understand not everyone lives at the computer. I often post and then dont check back for days.
You can, however, still order their pre-builts no matter where you live. (Its called "PowerSpec"). Theyre pretty solid. One of my friends (who has sadly passed; dropped dead of a heart attack at not even 40) was the manager at the Cincinnati OH, Store, which is one of the stores where they do the mail-order PowerSpecs. I got to take a tour there once. Pretty competent guys, do a good job. So if they have machines available or for order that you want, dont feel apprehensive about ordering them.
It doesn't have a G-sync module, but that is no longer required for G-sync compatability.
A few years back, nVidia enabled G-sync-Over-Freesync. As long as it is Freesync compatible, G-sync will work. You will HAVE to use a DisplayPort cable, though (its not supported over HDMI, not even HDMI 2.1). On very low quality Freesync panels it will sometimes have bugs, but on that Dell, itll be just fine. Its actually certified "G-sync Compatible", which is what nVidia calls it when they have tested the monitor to ensure it works but it doesn't have the G-sync Hardware.
If you've got the cash, id jump on that sale. Those monitors are really solid.
As for the "have to have it now" - if you can wait the 4-8 weeks (yeah, you might have a few weeks there without a computer if your current one dies), you can get a LOT cheaper than that 3800. Theyre overcharging (even considering the current price hikes!) at least 1,000$ on that original machine.
Hell, just looking on Amazon you can get this freaking
OMEN for less:
https://www.amazon.com/OMEN-Generati...s%2C185&sr=8-4
3200$. And thats Omen! Theyre one of the higher-end boutique builders.
This Thermaltake rig is actually not even badly overpriced (considering current GPU costs):
https://www.amazon.com/Thermaltake-R...%2C185&sr=8-18
And that was just a quick 10 second Amazon search for "RTX 3080 Gaming PC".
By all means get a rig with a 3080 (particularly if you're shooting for 1440p or 4K) but you dont have to spend 4k. You might just have to wait 4-8 weeks.