Serious answer, it's not a phone, it's a multi tool. Some of the things I use it for or have used it for. Computer (and all that that entails) Calculator Flashlight Map Alarm Clock Phone MP3 Player News Paper Remote Control for my TV Camera Watch Book (dictionary anywhere, encyclopedia anywhere) Compass Level Ruler It's worse at some of these things than a dedicated device would be but it's better at others. If you "honestly" can't see an appeal than you don't have much imagination. I was late to the cell phone game but once you've replaced a few of the needs above with a single device it's hard to go back. I wish it had a pocket knife on it.
I don't think it's a mistake. You are free to have your own preferences but to pretend that there is no perceivable utility or appeal to smart phone when compared to a classic cell phone doesn't seem like a realistic stance in my opinion. Not valuing the greater utility of a smart phone in light of the downsides can be a rational exercise of personal preference.
Lol, I can see the utility of having a car but I don't own one, same for cable TV. I could name a bunch of other things others can't live without which I eschew but I don't deny that they give pleasure and utility to those who possess them I really don't question tour decision but to say you can't see why someone would have a smartphone is silly. Edit And sorry that I'm at work and can't read whatever's being said on other parts of the post.