I’m aware of Graeber’s work. I don’t really agree with much of his conclusions or analysis, as he is an anarchist and I’m a Marxist-Leninist, but we would agree that much of office work is indeed socially unproductive, if we were to pivot to a socialist economy. That being said, we exist in capitalism, and thus office workers are working class, regardless of how necessary the work they do is beyond helping generate profit.