Apple just plainly has trouble with selling models that aren't the regular (cheapest / fine for most people) or the two Pro sizes people splurge for every time. There are market conditions, perceptions, and poor pricing on the sliding scale / unfortunate timing factored in though. Every time.
Mini, and Plus suffered same fate.
I think both were bad value props even though I enjoyed both: mini was 'only' $100 less than the regular model, and the market moved onto bigger phones. I was craving a mini phone myself, but I splurged for SE2020 earlier that year before 12 mini, and just decided 'screw it' and went iPhone 12 Pro with an irresistible carrier deal at the time (and ironically, I haven't opted to lock myself in for 3 years again, even though I'm still with the same one. Just for peace of mind)
I always wished I went iPhone 12 though that year (not 12 mini, the battery life would've bothered me coming off bad SE2020 battery life), for one less camera to have much better weight to handle. SS looks nice but the weight trade off isn't worth it. IMO. At that time, 60hz was still all there was on Pro as well as 120hz 'ProMotion' didn't come until 13Pro.
I later got an iPhone 13 mini refurbished last year a few months before iPhone 16 models came out, as a backup device and 'in between' and just for the novelty. So once the price got tempting enough, and the fact they weren't making smaller devices anymore, I went for it as a total novelty.
Too little too late, since they were already discontinued in terms of 'voting with my wallet' to Apple I want them to make another more modern, small device.
--
..You'd think Plus model would succeed given that (that the market has moved onto larger screen phones), but it was too closely priced to the regular Pro, and then at that point, a lot of people figured 'screw it' and went with Pro Max and paid more to get it if they didn't want the regular Pro or settled for the regular iPhone 16, which significantly outsold 16+.
I loved my 16+ because I got sick of Pro Max weight after 14PM and SS and the battery life was terrific. 14PM was the most annoying phone to handle out of any iPhone. For me. And I thought it was a great phone, despite that but it got annoying after having it for 2 years.
I wish it wasn't $1000 for the 256gb and 60hz only on the 16+ but I really enjoyed it despite that.
The regular didn't feel for me at the time after trying 16Pro, but I would've gotten on with it, and I didn't like the battery life of 16 pro so I returned that. Plus trading in my 14Pm offset the burn.
--
IMO even though Air is priced cheaper than I was expecting, it's still 'only' $100 away from Pro and that has 3 cameras and better sensors for the main one, vapor cooling, all the Pro hype, etc. etc.
And for $200 less you'd get a thicker phone but two cameras.
And then there's the general assumption people have of thin phones: poor battery life, and fragile. This device is extremely durable, but you wouldn't know if you didn't follow YouTube stuff. and I can't comment on battery life, it left something to be desired in my limited testing but at the same time was much better than I was expecting. Thanks to software optimization, hardware magic, and C1x modem power efficiency. But regular 17 still has better battery life and its cheaper.