Thank you for your message. You are absolutely right, cameras do not make movie by themselves. Indeed, without proper lighting and recording instruments (but also a good editing, good shot and obviously good actors) the quality of a movie reduces drastically.
So, I should continue filming on an iPhone, even because I need to acquire a good mic (I have a Rode videomic go but it broke few months ago, so I was thinking about buying the rode videomic pro) and other equipment.