Fragmentation needn't be an issue if handled properly. I think MeeGo is cleverly designed for fragmentation, whereas Android must avoid it - and Apple couldn't if they wanted to, lacking the variety in hardware.

Darth Vader is right in a way linking freedom to fragmentation. Could you imagine free software without forks and incompatibilities? But it needn't be a negative thing. Knowing it will happen to a certain degree, you'll just have to deal with it propely.