Without local dimming, the brighter the monitor gets the more washed out it will look - the image will just move closer and closer to pure white. That's why almost everyone who buys one of these "HDR" monitors that dont have dimming turns the HDR on once and never again.
I remember seeing a post on AVForums with some guy who bought a TV for HDR support and he posted two screenshots of a film scene and was confused why the HDR mode looked a lot worse than without it, the problem essentially was that there was a light in the scene which in HDR mode caused the (edge-lit) backlights to ramp up to full luminance and all of the dark areas of the scene were turned into various shades of greys like what you get when you have terrible back light bleed, without HDR engaged the backlights weren't anywhere near as high so black levels were kept under control - okay the light in the scene wasn't as bright but overall the contrast was much better due to the good black levels.
I might be ranting and OP may not be interested in either HDR or even a TV (I would recommend it for consoles) but I thought I'd try to explain to anyone reading why on cheap displays HDR is bad and you're better off without it, when I first moved to 4K I was caught out by TV's advertising HDR but having really poor implementations because I just assumed a TV advertising HDR would do it properly.
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