I still don't see how this ROM = Fragmentation. I mean if most Windows 7 computers from different OEMs had quite different UI's but they all ran the same software exactly the same (eg Firefox, MS Office, Quake3) ... I would say there is a lot of variations in Windows but I wouldn't say they're "Fragmented". In this Windows scenario, if you think its not just a variant but indeed Fragmented ... then you must agree that Ubuntu is "Fragmented" before even installing considering how customizable the entire user interface is.