For example, the story mentions the addition of blood pressure sensors as a reason for the issues:
> The next Apple Watch will come with new features such as blood pressure measurement, they said, which means production involves fitting a greater number of components into a similar size body.
Mark Gurman of Bloomberg says there is "no chance" [0] that the Apple Watch 7 will have blood pressure sensors. He points to his story with Debby Wu [1] instead:
> The new watches also have screen technology that brings that display closer to the cover glass using a different lamination technique, Bloomberg previously reported. That display layer may be causing some of the production woes, the person said.
It's probably a combination of larger watch sizes, new techniques/technologies, the usual upgrades, COUPLED with covid-related disruptions that are causing the delays!
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0: https://twitter.com/markgurman/status/1432798940676730886
1: https://www.bloomberg.com/news/articles/2021-08-31/apple-s-n...