yea, we know that the LG panel by itself is not the whole story in the Apple world, they do have their own custom controllers since way back.
I'm not sure what point you think I was trying to make, but that isn't it. My point is that any product, regardless of who it's made by, has compromises, and priorities.
In the case of displays, various factors affect how much data is being pushed across whatever transport connects the panel to the graphics processor: resolution, refresh rate, bits per pixel.
It's kinda like the quote about project management: Good. Fast. Cheap; pick any two.
In terms of the limits of display transport technology, you literally can't "max out" all factors, one or more aspects are always going to be lower than the absolute maximum they could be.
The linked LG 4K 144Hz display was released august this year (2020) and is the direct successor to a 1440p/144hz display - for that model they've clearly chosen to make high refresh rate (which I suppose makes sense for a gaming monitor) the key factor. Yes it also has 10bit colour, but as I said, it's "only" 4K. While that may be fine for the target market (where higher resolution is often not helpful because a lot of customers can't/won't run the game at higher resolutions anyway), it's significantly lower than even the 5K 27" display, and it's much lower resolution than the 6K 32" display. Those both focus on resolution and bit depth. This is my whole point. Different products; Different priorities.
No one goes into a ford dealership and asks why the new Mustang doesn't have room for a dirt bike in the back, when the <insert competing brand's pickup truck/ute> can.
i myself am looking at the 27" 4K 144hz monitor to set up a future hackintosh rig, knowing that retina will be available only at 1080 resolution, but that's just me, i'm fine with that slightly larger (as opposed to default 1440p retina on the 5K/27" iMac - which i sometimes find sliiightly too small) font on the 27" screen
You may well be fine with it. I personally wouldn't accept a PPI that low, and I definitely would recommend trying things out before committing to a purchase if you can. I'm using two 4K 24" displays, and even on these, 1920x1080 is too low for the "looks like" resolution. Thankfully macOS' hi-dpi mode scales, so I run them at "looks like 2304x1296", and it's mostly fine (wouldn't hurt to have a bit more oomph than what the 2018 Mini has for GPU though).
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