Yea, agree.. my ideal consumer iMac would be a 24" 5K display with thin bezels. I think that would be the sweet spot for a large size but still compact. I don't see that happening at all sadly.
I have a Dell P2415Q 24" 4K display hooked up that I run scaled at 2304x1296, because 1920X1080 (@2x) is too big and 2560x1440 (scaled) is too small. Unfortunately, the 5K Retina resolution of 2560x1440 (@2x) is simply too small for a 24" display. Apple is going for a specific DPI (~220), which is how they calculate the optimal screen size.
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Similar to the above post, the target DPI for Retina (@2x) determine the screen size, which then determines resolution of the display. If Apple was to create an iMac with UltraHD display to run at Retina (@2x), then the screen size should be right at 20", not 24", but I digress.That sounds blissful and also my ideal iMac as well. I’d love to see Apple replace the 21.5” with the 24” in 4K. I’d buy that machine in a heartbeat!
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The 7nm will also be used on the AMD Vega Instinct, which is decidedly not low to mid (Navi, also 7nm) - https://wccftech.com/amd-demos-worlds-first-7nm-gpu/ - hopefully, Apple will get early access to Vega Instinct for inclusion in a future revision to the iMac Pro along with deployment in the 2019 Mac Pro.From what I've seen and read of PC forums, the AMD 7nm GPUs will be low to mid entry now, i.e. The best card will be a replacement of the 580 in the iMac non-pro. We will have to wait a while longer for the top end cards, which will certainly be a huge leap over current high end cards such as Vega 56 and 64.