I always felt there is something wrong with all those smartphones. Mostly because I had a feeling they are time wasting devices (don't get me wrong there are still a certain percent of people who do real work and are very dependable on smartphone and that's ok, but I am not one of them, as for now at least...). When you look at all those apps people install, like 5 different IM apps, 5 social network apps, 10 games, 5 productivity apps... like what the hell? I used to "consume" phone like that, but after few years got really tired, so I introduced life rule that made me feel much better about these devices. Do not install anything that you do not need (Thinking like "Oh, this could come in handy for X situation", no!). Use one app for one task... So I use stock apps and one app for every need I have. So it makes it 5 additional apps besides default ones. And after all that decluttering I found that I simply do not use smartphone as smartphone. I use it as a phone. (Only "heavy usage" could be music where I have Spotify, SoundCloud and Music app installed). I kinda felt better, like I had few more hours packed in a day, so it would be better for me to spend them differently, sit down, order some coffee in cafe and stare through the window, better than staring at 4.7 inch screen, scrolling dozens of unimportant informations...
Those reasons are all less technical but equally important in my opinion.