I was a LONG time supporter of Windows Phone when it existed as Pocket PC on a Dell and eventually got a Cingular 8125:
Really enjoyed this phone...played endless hours of Age of Empires on it. Used Windows Mobile Device center to keep it in sync with my Outlook. It was an all round good phone. Then moved to the HTC Fuze:
This phone still featured a slide out keyboard and I got into flashing ROMS's from XDA so I could be on Windows Mobile 6.5, which I actually liked and lived with it's quirks. I used it long enough to use the first Windows Mobile Store that helped with not having to side load all the time.
Windows Mobile was a geeks dream, at least for me.
I joined a pre-launch Windows Phone Series 7 forum (if I could remember the name, might be able to find it on Archive.org) and was so active in there that I won a Zune HD. I was excited about Windows Phone. Yet by this time, I had made a short detour to Android (going through the Captivate, Infuse and Skyrocket) before finally getting a Lumia 928, when I felt that Windows Phone 8 was ready for prime time.
I loved Windows Phone 8 and jumped into the whole Windows 8 "ecosystem" with Surface RT, Windows 8 and everything. I made it work and I loved it. When my work offered to pay for my phone (Verizon), I went with the Lumia ICON and loved that phone so much.
In the fall of 2015, when I was starting feeling the app gap and seeing apps pulled, I felt that my relationship with Windows Phone was coming to an end. I waited patiently for the news to come if the 950xl would work on Verizon and when it was verified it would not, I moved back to Android and I am here to stay for the foreseeable future.
I still fire up my ICON to stay up on the Insider Builds and I do prefer the Windows Phone UI, but yes, it DOES come down to apps. There would be no Windows if we didn't need applications (Office, AutoCAD, Photoshop, Steam, etc.) And yes, the app gap is real as I can't get these often used apps on Windows Phone: Spiceworks, Neato Robot Vac, Alexa, YouVersion (with "Events), Cardboard/Daydream, WalMart Pickup Checkin, Feedly (official app), Phillips Hue, Lightroom, Mothership/Chore Monster, PocketCasts, Silver Dollar City App, among others...it really does come down to apps. I also like a smartmatch and I was an early adopter of both Band's but alas, that is over and I've moved to Android Wear and really like it.
I wanted Windows Phone to succeed and to pretend it is still "something" right now is truly acting in denial. Trust me, I've been there. I agonized for months moving from my ICON to Android. But the writing was on the wall. Windows Phone was dying and there was no need to hang on.
If they do make some kind of come back, I'd be back.