I can relate to much of this. I don't dislike how iOS works---in fact, overall I prefer it and many aspects vs. Android (i.e. much prefer Safari over Chrome, like iOS widget implementation better, prefer Control Center type controls from the bottom, integrated visual voicemail, gesture navigation, I actually use/like 3D Touch, and the watchOS is miles ahead of Android Wear in many regards, just to name a few). All that being said, I first, just don't see the value in the 7 model, both in comparison to the 6s/6s+ and compared to the rumored changes in 2017 and second, I think Apple needs a good switch kick in the backside from customer's who are tiring of their antics (i.e. removing Homekit support from the Apple TV gen 3, the headphone jack, parsing features to only certain devices like the dual camera, their ridiculously slow upgrade cycle of their Macs)--and I'm about as devoted an Apple customer as they come without being blindly loyal.
I question the overall path Apple is taking with their hardware and software and while I do very much still enjoy using what I have, I can't invest more money in new products when I'm not sure that investment will be worthwhile in the near future. So for now, I've voting with my wallet and testing the waters elsewhere.
P.S. And I'm right there with you regarding a solid Chromebook. The problem is I want a convertible in much the same fashion as the Surfact Pro/Samsung TabPro S/iPP 12.9--highly portable tablet first with an attachable keyboard to use as needed, and there just isn't anything like that yet.
P.P.S. Oh, and while I really like the Samsung TabPro S hardware and form factor, my time with it has shown me I won't be switching over to Windows for that convertible experience anytime soon--still doesn't compare to MacOS, IMO.