Good points. First off, I like the convenience of having music on my phone, but so far I haven't heard a phone which sounds good. I mean, they sound good when playing music, but there are often subtle pops and hisses when other sounds, like alerts, play, and sometimes between tracks when one track ends and another starts there is a just barely audible click. I also HATE the fact that every time I get a text, calendar alert, facebook alert, or other alert the phone will pause or mute the music to make the alert known. I realize I could turn off alerts, but when I am not listening to music I want to get the alerts, so I'd have to make a profile for listening to music and switch between profiles every time I start or stop listening to music.
I also want more capacity. I can get about 40GB to 60GB of music on one phone (32GB internal and 32GB external), and the new Samsung phones support 64GB uSD cards. I prefer to have 128GB or 256GB of storage.
Also, even the Nokia phones I've tested do not sound as good as my Zune players. I believe it has something to do with the fancy headset mic accessories, but it could just be saving a buck or reducing the size of the audio section. If I use a separate headphone amp, like the small Fios, they sound better. The Zune doesn't require any such add on amp.
So, there you go.
But, I am just thinking here. I probably won't get one.