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I do not want Apple to go 32" 6K using the XDR panel because there is no monitor using a 3008x1692 panel so I'd have to get a 4K panel and run it at a lower-than-native res which will result in blurriness - and I use my second display for text, so that is kind of a non-starter for me. And buying an XDR as my second display is also financially a non-starter.
Apple doesn't necessarily have to use the full exotic ( blue light and filters and 1000+ sustained) backlight on the 6k panel on an iMac Pro. Same panel foundation but a backlight that is in same range as the current 5K panel would work fine in a "twin" set-up with one for text , email , etc. and also a XDR attached.
If there was a supported but not exotic backlight system then LG could pump out a 6K UltraFine if Apple didn't want to do it. Matching those up as a pair would probably not "break the bank" with a XDR. And othere folks with larger budgets could pair up iMac Pro and XDR. If Apple commited to a contract for couple 100k per year for 2-3 years for a very good 6K panel ( as opposed to a XDR varaint ) then probably could get the panel vendor to do a independent product. Same way Utlrafine 5K fell out of doing production runs for iMacs.
Also don't need $900 stand magic magnetic mount point either. If take the basic 6k panel size take the super sizzle over engineering flourishes off of it, then would have decent panel for an iMac Pro which wouldn't drive up costs all that much. If Apple had found some CPU-SoC pricing declines then could have a trade-off for the increased screen size.
Another path would be the 6k-2880 of just taking the current 5k display a bit more "ultra wide". ( again essentially same backlight as 5k display to control costs. ). Wouldn't pair up exactly with the XDR but it would work for now .
Once had a 6k iMac Pro chassis then in next iteration (or one after that) could weave in mini or micro LEDs and perhaps go 'XDR' when the costs were more reasonable. But skip on first generation.