The VA manufacturers love to use split pixel rendering and split pixel dimming for some reason on many VA panels. Which does affect appearance of text and other. Can't judge from those pictures which is neutral sharp or not especially with smoothed fonts it's nigh impossible.
The input lag has been measured "low" https://pcmonitors.info/reviews/aoc-...Responsiveness
Yeah it's a bummer NV takes it's sweet time to polish off the drivers for proper adaptive sync support. Essentially initially they only enabled what they had for their Gsync and prayed it would work so to speak with 3rd party solutions but there is more to it than sticking a head into sand, they have to cooperate, adhere to specifications which they are by now infamous for violating to their own desires (they had some proprietary DVI stuff before, which made it not work/be compatible with some, don't remember details anymore).
I have some finger nail thick gap between the plastics under status LED too. These plastic frames never fit perfect on any monitor, at least it's not shining a backlight at you through these holes, seen that too by now on some monitor with backlight leaking through/around frame away from the LCD.
There is always the option to not buy NV GPUs until they sort out their driver issues, but then there is not much else to buy with how AMD has thrown the towel in and gave up competing...
Does the default range 48-76Hz with 75Hz refresh work for you? There is not much reason to try and hunt the lower Async range, if you're getting lower than 48fps then the visuals area already pretty unresponsive and choppy.
You want to run minimum fps or at least average at least as high as your 72fps limiter max.
Response time specs are fairly meaningless. Yes the higher price of 32QK500 makes it less appealing considering the cheap 144Hz options out there (even though "all"/"most" are bad) that are not far above in price.