The problem is you almost need to consider 100% coverage jobs as a separate category. Late shift starting time is more decided based on when they want the early

The problem is you almost need to consider 100% coverage jobs as a separate category. Late shift starting time is more decided based on when they want the early shift coming in than their own preferences. Similarly for "after hours" jobs such as cleaners or pub staff. They are required to start after everyone leaves so kind of get limited based on that (although that is only a one sided limit, so you could see if some started later). However I think you do have a point, there are a significant number of jobs where this is still valuable, such as those that want heavy coverage but overlap shifts enough for there to be flexibility, or jobs that want night time (vs after hours) such as astronomy.