Comment by type-r

Is it? In general at every place I've worked the vast majority of the work has come from launching & supporting new products. Existing infra does not really break that often, so if we just want Twitter as it is, that should be doable by 1/10th of the people. I'm not picking just on Twitter -- I feel this is the case broadly. Maintenance of a system that doesn't change is fairly straightforward as compared to innovation.