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A comment on Q&A with the developer of BetterDummy: from macOS secrets to his motivations. Parent comment

Re:Q&A with the developer of BetterDummy: from macOS secrets... by pedrocr on Tuesday December 07, 2021 @09:25AM (#29472767)
We can discuss how much angular resolution is enough but we clearly don't need 300dpi for a billboard. To get the same font quality when looking at a phone, laptop or external screen a different dpi will be needed.

Here's Apple's range of Retina displays:

https://en.wikipedia.org/wiki/Retina_display#Models

The DPI difference between highest (iPhone 12) and lowest (Pro Display XDR) is 2.2x. The angular resolution difference at typical viewing distance between those two screens is 1.1x. Clearly the angular resolution at typical viewing distance is a much better definition of what's good enough resolution than the DPI.

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Re:Q&A with the developer of BetterDummy: from macOS secrets... by 4ad on Tuesday December 07, 2021 @10:08AM (#29473205)
Yes, and with the exception of a discontinued LG monitor, and a $4k Dell display that doesn't work on macOS, nor on Linux with OSS drivers, no external non-Apple display can provide the required angular resolution.
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Re:Q&A with the developer of BetterDummy: from macOS secrets... by pedrocr on Tuesday December 07, 2021 @10:50AM (#29473764)
That totally depends on what angular resolution you require and what distance you are comfortable with. Using that list Apple's Retina concept starts at 57 and 4K 27" is ~60. And even that is assuming you place a 27" screen the same distance away from your eyes as a 24" or even 21" screen as all the iMacs use the same viewing distance.

But I'm glad we got over the idea that 220dpi is a magical number. Otherwise not even the iMac or the Apple Pro XDR displays counted as HiDPI.

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