I can only speak for myself, but I rarely want to change the way I work with my phone (well, more so lately, but that's a separate Blackberry rant ;) ), and I wouldn't ever want to change the way my mp3 player would work if I had one. But I almost always want to change the way my computer works, since I interact with it in such a rich way and it provides me all of my money. I want that flexibility to hone my tools, but I don't want the flexibility to hone <i>all</i> of my tools..