m2 is a much bigger die on a bigger package, A18 pro is not just a smaller chip with better wield, it sit on a smaller package (thus the 8GB memory limit).The A18 Pro is built on TSMC's 3nm (N3E) while the A19 Pro is on 3nm N3P. You could easily move onto the A19 Pro and at least have a current chip in the Neo's. The A18 Pro is 98.7 mm2 while the A19 Pro is 105 mm2. Not exactly breaking the bank here. As for the M2's to be in production, it would be even cheaper since they're built on TSMC's 5nm. Really does seem like Apple had a lot of A18 Pro's laying around.
With an a18pro your memory in INFO-PoP package wise for a very small soc (decade of aggressive iPhone physical size constraint), just dies alone you have 50% more a18 than m2 if not more with a bit better yield, making the tsmc 3 tax over 5 not much of an issue. But also the smaller package cut cost, m2 is a big in comparison complex substrate for the in package memory modules (and yield loss when something happen to the memory being attach goes wrong)
A18pro used in the Neo laptop are in part binned down from the iPhone (so yes could be stock in hand) has the iphone pro used the 6 gpu cores while the laptop is down to 5. But it would still be a cheaper computer to make (power delivery, cooling and so on will also be a tiny bit cheaper) regardless.
as for easily move into the a19 pro, if you look at m5 vs a19pro benchmark it could mess up with their product line (do not listen to some apple do not mind cannabilising products talking point), but also not sure the yield is already has good and the a19pro line are I think made with a more costly 12gb of faster ram and with that type of packaging the ram-cpu are fused at TSMC not later on ?), 12gb of 8533/9600 LPDDR5X vs 8GB of 6400 is a really big deal right now at that price point.
When something is cheaper than the other option, there is not much need to speculate more than that.
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