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I wonder if this is a stopgap until next year, when perhaps the base iMac gets redesigned? If Apple is going to go to the trouble of creating their own monitor, leveraging the R&D and production tooling behind an iMac design would be a good way to reduce the costs of developing their own monitor. ...
IMHO, this is more of a 'gap' than a 'stopgap'. Apple has a chokepoint on design resources. if they are full on redesigning the iMac then that is just less design cycles available to do design on a 27' and/or 24" display docking station. That is exactly why the work is outsourced to LG ( LG here are some basic constraints: only one input , no buttons. similar screen to what we are using in other products , etc. ) apple will help with the driver/software controls (no buttons ) and put a floor under number of units sold ( some investment to do R&D and commitment to selling them prominently in Apple stores. )
They are outsourcing it because it is a nice to have but not particularly strategic.
One of the biggest efforts in their XDR monitor probably is not coming to the iMac at all. The backlighting isn't likely. A 6K panel with the level of backlight they have now on the 5K really doesn't buy a whole lot. But the iMac doesn't particularly need a cost increase. ( still hanging onto spinning HDDs so it is an issue).
The iMac Pro could probably do with some volume increase so absorbing 6K with a good (not XDR) backlight would work much better. The iMac Pro volumes would be an incremental scale increase. And the new 5K display docking station could take the place of the old 5k iMac Pro volumes.
At $5K a pop the XDR probably makes a healthy margin to pay for itself. And the $999 monitor stands have a huge Return on Investment chunk in there too.