There's no doubt you can create lots of stuff, and I would not say otherwise; the iPhone has a nice camera and the tools for media production on the iPhone are actually pretty ok.

All that being said, I don't do any of that stuff; I write software and write the occasional blog post. For me, I need a compiler, text editor, git, a good terminal etc. In this regard, my old Packard Bell is honestly more powerful, and despite my iPhone having objectively awesome hardware in comparison, I accomplish much less.