It must be remembered that this is a very specific situation, an office where the majority of staff spend a good portion of time away from base. That means that the entire job is based round the principle of being mobile from the start. Any regular tasks that prevent that mobility are taken away and given to someone else who is single site based.
If you tried to apply this to 90% of offices it simply wouldn't work because the demarcation of those roles is not there.
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