I think it was just a difference for difference sake with the wand. Sir could spend £more to be able to fit tools to the hose etc. Not 100% sure though, there could be a genuine reason. The clutchless 04s were always sold more cheaply than the clutched ones.
But when the dc07 came along, they did away with that and the hose and wand were the same for clutched and non clutched, hence why I think it was a market positioning decision to have them different.
Its a pain when the hose breaks though, you can repair a clutched hose, not a clutchless one