For those thinking I already made up my mind and I'm posting for no reason, I most definitely did not. I've had my Lumia 920 for more than 2 years now and I was amazed by its capability. After all the struggle it has gone through with updates and rollbacks I can see it's not handling Windows 10 that well, especially with its old hardware.
I would never switch to another platform, and not really because I hate iOS or Android, but because I love Windows so much. Lag was the one thing I never worried about with this phone, but the app gap is simply not tolerated anymore on my side.
The store has the crucial apps, but why am I receiving missed calls on FB messenger? Because I can't answer them on my device. No video calls on Viber. Twitter, Facebook and Instagram couldn't be more behind those on other platforms. I realized that even the apps we have are outdated. Third-party apps are mostly great, but it just isn't the experience I want. And this is not just the case with social network apps.