Why do all these redesigns have serial numbers ? what purpose do they serve ? Submissions to HN move up and down dynamically - remove the serial numbers and sh

Why do all these redesigns have serial numbers ? what purpose do they serve ? Submissions to HN move up and down dynamically - remove the serial numbers and show (302 points..25 comments) which should be CLICKABLE. This will bring front and center the only two things that people judge in deciding to read a submission. Plus it will make it easier to click on a mobile device.