I imagine most YIMBYs would welcome the agglomeration effect, given it means more high-paying jobs created as a result of the economic efficiencies it enables.

I imagine most YIMBYs would welcome the agglomeration effect, given it means more high-paying jobs created as a result of the economic efficiencies it enables. Lower cost housing is a means to end, not an end onto itself. That end is a higher quality of life, for more people, and more productive higher density cities provide that.