The AW3423DW does have a G-SYNC Ultimate module. Some users complain of noticeable fan noise from the module, but my experience is my tower produces louder ambient noise that makes the monitor's fan unnoticeable. Edit: There is a significant cost for G-SYNC Ultimate module, though it is difficult to quantify. The $500 figure was from 2018, though I see $200 premium from G-SYNC Ultimate to FreeSync monitors of similar caliber. Reference the Acer CP7271K GSYNC Ultimate versus the Acer XV273K FreeSync, both 27" 4K @ 144Hz at $699 and $459, respectively.
The 27-28" 4K monitor market is too crowded with $300-$400 devices. Samsung made significant progress in increasing yields of its QD-OLED panels, but they are still low, and the costs still high. I doubt many would be willing to pay $700+ for a 27" QD-OLED panel right now, which is why Samsung targeted more expensive and larger formats that offer greater margin. However, Samsung will abandon LCD entirely. They intend to manufacture solely QD-OLED panels for TVs and monitors by Q1 2024 (Eun-Jin, Kim. "Samsung Display's QD-OLED Display Production Yield Reaches 85%." Business Korea, 5 Jul. 2022). That is great news for consumers seeking smaller QD-OLED panels, and I would estimate seeing a few available by Q3 2023. We are witnessing a revolution in monitors, with thinner, lighter, and more vibrant displays within reach of most gamers. It is really an exciting time to be a gamer.