I think part of it is around what the HR organization is built for, construction companies that do self performed construction are used to hiring growing their

I think part of it is around what the HR organization is built for, construction companies that do self performed construction are used to hiring growing their workforce 10x and shrinking it down again. I think the thinking at more knowledge based firms is that They want to Keep their W-2 employees people they perceive to be the top performers, that they want to keep retain long-term, and that have long-term potential at the firm, if the position is viewed to be more commodity ther can put them on contract with a staffing firm, and not have save marginally, but really mentally keep track of who long-term vs. temporary / commodity