I think you are vastly over simplifying what the iPhone was to the industry. The iPhone wasn’t just a native browser, it was also the iPod, Messaging with a full keyboard, and an intuitive integrated phone with visual voicemail. Also Apple through the iPhone freed us from being under the thumbs of our carriers and they’re terrible adware software. At the time I hated my phones so seeing the iPhone wasn’t just an easy and natural progression, it’s something I needed. A folding screen seems like engineers creating something that has no need. I don’t want it. It seems like 3-D TV “let’s do it because we can” not because it’s a good idea.