I think the 6s was a test phone. Fortunately for me anyway!
Yes, even at the time, when teardowns of the 6S found the gaskets and whatnot, but without a public claim of water resistance, people hypothesized that it might be a testbed, with a future iPhone actually being IP rated. They turned out to be right!
As for Android and Sony, I'm not sure I could cope with that combination. Sony make pretty things that just don't work very well using the Japanese ethic of "shiny happy hardware, oops we forgot the software". I also got fed of Android about 6 months ago and bought an iPhone. I find Android like a slightly mental, needy girlfriend. You know the one that wakes you up at 3AM to make sure you're not being unfaithful in your dreams. The one that knows what you ate for lunch just by the look on your face. The one you find has been stalking you for the last 3 months. The iPhone has a "STFU and leave me alone" switch on the side and requires little attention from me. I don't even have to stick it on flight mode overnight to leave me alone. I sleep better now. Not once have I considered throwing it at the wall which was the fate of my Nexus followed by shouting "I'm going to the apple store you dick" at it.
[tech history excursion]
You know what I said for many
years? "If only Apple could have Sony's hardware engineers."
Now, in the many, many years since I first said that, Apple's hardware engineering has gotten extremely good and has probably fully caught up with Sony.
But for example, in the iPod days, I think Sony probably could have gotten two or three times the battery life, and still made the devices smaller. Power efficiency and miniaturization were always Sony's fortes. For example, they made a high-end cassette Walkman in the 90s that was barely larger than a cassette case, and ran for 37 hours of a single AA alkaline cell. And that thing had to run a tape transport the whole time, whereas an iPod was running from a RAM buffer 99% of the time! (The first iPods got 10h on one charge, and it wasn't until 2007 that Apple caught up with that Sony Walkman's 37h -- and even then, only in the jumbo-size 60GB iPod.) For context, by 2001 when the first iPod was released, Sony had already released MiniDisc players that got 60h of playback on a single AA in standard-play mode (and 80 in long-play mode), and even Discmans that got over 30h of playback from two AAs -- and that's CD, which was not originally designed with portability in mind. (I believe that one thing Sony did in late Discmans to save power was to use a higher-speed CD mechanism, like 4 or 8x or something, combined with a large RAM buffer and audio compression, to basically rip a song to RAM at much faster than real-time, then shut off the drive and play from RAM. I wish I remember what I did with my last Discman!)
Anyway, an Apple-Sony collaboration wouldn't even have been unheard of: Sony was the original supplier of 3.5" floppy drives for Apple, as well as the OEM of many Apple CRT displays (the ones with Trinitrons, of course), and as a LiIon cell supplier. But most interesting of all was the PowerBook 100: Apple literally approached Sony with the schematics of the Mac Portable*, and asked them "can you shrink this down"? Sony succeeded magnificently, producing the PowerBook 100, arguably one of the first subnotebooks ever made. (I do not know whether Sony also
manufactured the PowerBook 100 for Apple, but they definitely did the engineering.)
*The Mac Portable was a luggable with a beautiful active-matrix TFT LCD, but with a large sealed lead-acid battery, desktop-size 3.5" floppy and hard disk drives and a desktop-style mechanical keyboard, weighing in at 17lbs, the same as a Mac SE, just battery powered.
[/excursion]