the thing is, lots of people think of cutting down the amount of devices to carry with them.. if you are a music lover.. the iphone CAN NOT do this.
Nope, no phone can to my knowledge. Because, well, it's a phone.
Not everyone has time each day or week to sync and plan their music for later.
I do have the time, but I guess it's just not that important to me. I have the same 4 gigs or so of music that was on there 3 months ago. I like what is on there, and don't need to "plan" what I'm going to listen to every day. I guess also, I don't use the phone as my primary source, so that helps.
I understand the OP's concern completely. However, I don't understand why this forum is littered with posts saying "I have an 8GB iPhone and it's NOT ENOUGH to carry my 30GB of music!" Well, my god, call CNN...when did this epiphany strike you? Sometimes, it's just kind of fun to get into these people's heads.