Is it just my phone that can play FLAC? I don't really get all this hype about hi-res DAPs either. I'm not saying they must be bad or pointless, just that modern phones can pretty much do the same, can't they? Sure, if you want to listen to music with a hard-to-drive hp, then you'll need more power, but who wants to use high-end orthos, etc. on the bus? I think there are really good, easy-to-drive but higher-end headphones out there nowadays, that do just fine with a phone and nothing else.
Sure, sound quality might be better as well, but these new smartphones have pretty decent DACs and amps inside them. You'll surely get a bit better SQ from a dap, but is that marginal improvement a priority when you are listening on the go?
Although I will admit that if I had an iPhone, I'd get a dap just to get rid of the crappiest audio sync software in universe, iTunes.