I did think, and still do, that with the iPhone 15 non-pros, they never originally intended to use that processor. Maybe there was meant to be a version of the one in the 15 Pro, that was better than the iPhone 14, but not as powerful as the iPhone 15 Pro, and it just had issues, so they went with the iPhone 14 processor, as knew that would work fine for the phone.The big mistake was using the iPhone 14 processor in the iPhone 15 (first time they ever did that). They goofed and probably hadn't committed to this extensive plan of onboard AI LLM/LAM processing. While I'm sure they *could if they wanted* bring a subset of the AI features to older phones and the iPhone 15, the problem is AI features by their nature are nebulous, often used by voice request (as opposed to seeing or not seeing an app, or feature in an app), and it might be confusing how to show or tell a user what a specific model of device can or cannot do. Now Apple makes it simpler because they are dividing devices into able to do AI, unable to do AI with no confusing middle group. It really stinks that the iPhone 15 being sold today (which for example I bought my son just 2 months ago) is cut out of these new features.
I've got nothing to base that on, other than experiences of a similar nature thematically, in my work life.