Role of a Social Worker, Part sqrt(2) of infinite

I'll say this upfront to get it out of the way first. The social work profession in Singapore is less mature than in other countries, for now. At present we have both a low average standard of social work education and few niches of advanced specialization. The Singapore Association of Social Workers is making some plans to change this in the near future. But at the present time this is how it is.

Given all this apparent lack of formal structure, have you ever wondered one rather obvious thing: why do social workers seldom work in pairs when seeing an individual client?

Is it because the work is so simple that it can be handled by one person? Or that the work is of such a nature that it is best handled by one person?

Consider this question for contrast: have you ever seen counsellors work in pairs when seeing (counselling) an individual client. Why, or why not? Is the work so simple that it can be handled by one person? Or is the work of such a nature that it is best handled by one person?

What other jobs does social work bear close similarities to?

Some thoughts to throw to you, dear reader.