This is an interesting idea to parse. I began to try to think of two "big changes" that happened in a single year to iPhones. Of course that term itself is debatable. What is a "big change"? Did every new model of iPhone usher in a "big change?"
In my mind, a "big change" (I'll stop using the quotes now) is something that brings an ability to the iPhone that we didn't have before, in any native fashion. Pro Motion, for example, is something a lot of people love, but I wouldn't call it a big change: I had a screen before, of the same size, and I could read all the same things. Pro Motion made it BETTER, in some ways, but I don't consider it a big change. So I thought, what would be all the big changes in the history of the iPhone?
--iPhone 2G: the iPhone now exists
--iPhone 3G: third-party apps
--iPhone 3GS: video recording
--iPhone 4: retina display*
--iPhone 4S: Siri
--iPhone 5: larger display*
--iPhone 5S: Touch ID
--iPhone 5c: colored chassis*
--iPhone 6: plus size*, Apple Pay
--iPhone 7 plus: multiple cameras
--iPhone 8: wireless charging
--iPhone X: Face ID
--iPhone 14 pro: Superfluid Atoll
*The ones I've marked here are the ones that feel like they are the least "big". But I feel that the retina display was a huge breakthrough. Anyone that was using iPhones back then remembers just what a huge leap that was. We went from a feeling of "pixels under glass" to "pixels ON glass". I think the increases in display size are fundamentally important, even though "hey, I had a display before and now I still have a display, how big could that possibly be?" With the 6 plus it was the breakthrough: the iPhone was never again limited in screen size. I don't consider the mini's size to be a big change in that users could still buy a smaller phone in the SE 2020 (the mini is a technological wonder, but I don't feel it gave us anything fundamentally new). I've counted the 5c's color palette here, again as something that broke free of a mold, but a lot of people will certainly reasonably disagree.
Anyway...you may be right, there isn't a single year where an iPhone came out with two fundamentally big changes in the same year, except perhaps the 6. On the potential 15, I don't think that either of the features you're describing is "big" in the way I'm framing it. I already power my phone with a wire. That it's now USB-C instead of Lightning barely moves the needle. And an under-display fingerprint sensor would be cool...but we've had Touch ID in the past, this is nothing new.
(I do consider the Morphing Key to be a fundamental change, but again, that's something reasonable people can disagree with.)
So this has been a long way of saying, "Yeah, you're right, Apple doesn't bring out two big features in the same year!
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