I still don't buy it. This still misses the mark - it wasn't about a 'few' buttons, the iPhone was about none. All those pda's in the picture don't really mean anything to me. Sure, some of them had cell networking and a lot (most? all?) had wifi. But I would never consider the old pda's a mobile device. 'Mobile' to me comes from the term 'mobile phone', not 'mobile pda'.
To me, this article is typical of OSNews - if it's not Linux or open source, it bad/wrong/etc.
Anyway, Dan Frakes tweet wasn't talking about 'a few buttons being obvious' he said 'having no buttons/keys'. And like he said, if this was so obvious, then why wasn't everyone doing it in 2006? Howcome pda's didn't do this in the early 2000's? Because it took a visionary team of designers and execs (or just Jobs) that appreciates minimalism. No one at Compaq, HP, Microsoft's many pda OEMs would, no, could have done something like this. And don't forget the require stylus..