This reminds me of an opinion that I have which I've been looking for an opportunity to flesh out and share. Despite all of the research and engineering that's gone into the user interface (and "experience") of smartphones, text messaging as an interface has one massive advantage: the perceived cost of sending a text is miniscule in comparison to other operations. I don't have units, but it's probably an order of magnitude lower in any reasonable ones.

Maybe I'm projecting onto "the general public" when I make this generalization, but performing operations on a smartphone (aside from call/text) are oft accompanied by the very real risk of squandering your time away. Especially when a browser is involved.

There is something elegant about the interface of a dumb phone, especially a flip phone: You pull it out of your pocket, whip it open, type your text, send it. And then crucially, you flip it closed and stop thinking about it. This is the key. You're using it when you're using it, and you're not when you're not.

Even grander generalization and possibly controversial opinion: I hope that consumer technology begins to cater more to those of us who wish to use technology in this way - as a tool that you pull out of your pocket and promptly put away upon achieving your ends.