with another scaling the performance will be affected
I'm using it scaled on a 4K 24" and have zero performance issues. Sure, it needs more memory, but it's hardly the biggest use of memory in my system, at a maximum of 1.5GB.
Your Mac will consume more power to run the display, it means more cpu/gpu/ram usage, warmer temperature, fan running
I think you mean more power to run the GPU - the display is still displaying the same number of pixels.
I bought the machine to use it, not to be a collectors item, I make money from this. You might as well claim "you shouldn't drive your car because that means the engine will have to run".
And also many graphic bug like stuttering, bad display in full window, artefact at booting/logging, monitor disconnection, issue in sleep mode and more
I have no idea what you are talking about with any of this.
The reality is, people all choose to use their displays as they see fit -
@macdos likes the screen real estate of pure 1x (i.e. native display resolution), you clearly only want to use straight 2x scaled resolution, and the vast majority of people will use a scaled resolution that gives them a comfortable compromise between screen real estate, and UI size.
This is a concept that even Apple acknowledges and uses. On Retina MacBookPros since 2016, the 'default' resolution is
not a straight 2x scale - it's the first step up above that to give "more space".
So yes, it's true the GPU will work less on a straight 2x or straight 1x resolution. That doesn't by a long shot mean it's the only realistic option to use for a display.
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UltraFine 5K and 4K both support that when connected via USB-C (or TB3), that's one of the selling points.
Right, given that they're made almost exclusively for Apple, this doesn't surprise me - but what I meant was, I haven't seen the feature on any other displays.