I'm doing the same thing. Tonight is my last night with my Lumia Icon that I've had since release day. I was on Windows phones since their inception, through all the old "PDA" style phones until I finally got sucked into an iPhone when the 4s came out. At the time, I had also switched from a Tablet PC to a Macbook Pro, so it made sense. But four years later I went back to Windows when the newer tablets were being announced with Windows 8, and then I left the iPhones to come back to Windows phones. But in all the time now with my Lumia Icon, I've just been frustrated at the absolute lack of support from developers. And I understand with 10 (which ran for crap on my Lumia Icon, battery lasted a fraction of how long it lasted with 8.1 on it) that developers can write code for the PC that will run on the phone - but people aren't writing many things that I'm looking for on the Windows platform at all, so that doesn't help me either. My Ilumi smart LED's only work with IOS or Android. My Ecobee thermostat only has apps for IOS or Android - there's a windows phone version someone wrote, but you have to pay extra for that and it's not a company supported program anyway from what I saw. My Logitech Security system only works for IOS or Android. My Meccano robot app for the 4 foot robot only has a IOS or Android app. My home theater only has apps for IOS or Android. My Energy UFO only has apps for IOS or Android... My Sony transfer software for wireless only works with IOS or Android. Even a wireless camera I have needs IOS.
And it really stinks, because by FAR I prefer the OS and interface of my Windows 8.1 phone over anything droid or IOS based. The live tiles were what won me over in the first place. I still feel it's a superior phone. But without dev support and the apps for things I really need to use, it doesn't matter how pretty and wonderful the OS is when all I can do is see what the weather will be and use it for a phone. I'm tired of having stuff I have to pull out my iPad for when I'm at home.
I"ve been using a Microsoft Band as well, and if it weren't for the horrible way crap builds up on the sensors and starts scratching the skin, I'd keep using it with the iPhone 6s I'm getting tomorrow morning, but the engineering for that was just poorly thought out, and so I'm getting the apple watch to go with the phone...
And it's frustrating since I really prefer the Windows OS. But I just can't stand my phone being ONLY a phone anymore. I had hoped over the last year and a half or more that I'd see growing support for new tech things in the Windows phone area, but it's just not there.