Yeah, it's interesting how many of us feel this way about the perfect size being that of the 5/5S/5C/SE. I'm glad I'm not alone in thinking this, as when the 6/6+/6S/6S+ came out, it was beginning to look like they were abandoning the idea of the smaller 4 inch iPhones, and that would have been a real shame, as I really think they got the 4 inch models perfect. But it's good to keep vocal like this about these little things that mean so much to us, as it was all of us users who piped up about loving this size that got Apple to realize that many of us would make that choice every time, and probably wouldn't even bother upgrading to the latest iPhone each time if it meant we could only have the larger sized ones. Don't get me wrong, I did buy a 6S plus, but in real usage terms, I find that I hardly ever use it except for watching videos in bed, because even though it's still technically carryable to some extent, it still feels alot more burdensome to bring with me whenever I go out, and I don't find the screen of the 4 inch to be at all harder to use. They did such a good job with it that it feels just as smooth and easy to navigate as any of the bigger ones.
That being said, while the carryability factor is really important to me, and that the height and width made a difference to that, while it may sound like smaller is better, I don't want them to go the other extreme and make them smaller or thinner than what they already got perfect on the 5/5C/5S/SE. (just making thinner increments is a huge mistake that many phone companies make, just so that they can boast numerical differences in their marketing, but has little to no advantage in the real world usage side of the equation). I'm not saying this is the same for everyone, but I really feel strongly from my own personal usage experience that I actually quite like (and in so many ways prefer) the thickness of the 5/5S/5C/SE models, as they just felt more robust, and nicer to hold, and I never found that making phones thinner than that made any noticeable difference whatsoever to how comfortably easy they fit in your pocket. The 5/5S/5C/SE form factor will always be a winner in my opinion, and it's this size I will always look for, even if they keep making the bigger ones for those who like them. (nothing wrong with keeping the bigger sizes too, as I appreciate that everyone is different and there are many people who prefer that type. I'm just not one of them, and I'm glad to see that I'm not alone in thinking this!)
So a word of encouragement to Apple for listening to us when you brought out the SE! That was definitely a good choice, and please still keep a model of this size in all future model line-ups, as that's the one I (and it appears many others) will always be buying! Keep up the great work!