Separate with a couple of exceptions (pertaining to my iPhone).
It has a gps that I infrequently use. If I did a ton of driving in unfamiliar areas, I’d get a separate gps.
It plays games, but I rarely play games. If I was an avid gamer, I might get a game specific device.
It has a camera but I rarely use it as I shoot photos professionally – so I have a DSLR and a couple of other digital cameras.
As for household items, I always buy separate for all the reasons listed above. Although, the Bose Wave Radio as always intrigued me as an alternative to component stereos.