> [...] when most devices had tiny screens and half their physical size was a keyboard.
Ie Apple introduced a new, arguably better, entrant into an existing market, and managed to grow that market.
But I can see your argument that you can re-interpret being that first to really commit to a big touch-screen only and (almost) no buttons to be a 'first move'. (Though a different comment mentioned that Apple wasn't the first here either?)
The iPhone was definitely a successful device!