The basic assumption is that “two heads are better than one” and that together, in groups, innovative solutions can be found.
The use of experts should become part of the organisational culture - with emphasis on the building of expert teams if possible, (i.e. two heads are better than one).
This dual approach often works, proving that two heads are better than one. Likewise, one's workmate can take awkward calls, e.g. My colleague is not in today, I’m afraid. (BNC-B)