- Apple has improved the GPUs (you can now get Vega 20/48 with the 2019 models).
- Most, if not all, screens at 32" are 4K which would be a downgrade. If they go 6K with the XDR's resolution, any external monitor you use would resize your windows due to resolution mismatch. The only real option is an 8K 32" display, but those are still very expensive.
- Thermal improvement would require a new systemboard and would also likely mean the end of user-replaceable RAM (as the most obvious option is to use the iMac Pro's fan design).
- FaceID requires a case redesign as the current case is too thin at the top to allow for the FaceID module (it is also why the iMac still has a rather weak webcam).
- T2 is probably coming, but I am guessing there is a reason Apple has yet to add it to the iMac when it is on everything else (including the iMac Pro).
we are also are used to think 'inside' the box... vega is old tech, screens... yes and no: 27" retina was untinkable before iMac late 2014, yes the thermal improvement could require a new design (also time) and maybe so the FaceID, T2 (or newer) seems to be the way apple has chosen to improve what intel could not... I suppose fusion drives should go to make T2 happen in iMac.
my point is: the cpu is not the only possible upgrade... and not necessarily the one who brings more advantages to the end user.
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