I think the checklist formatted scorecards provide a quicker/efficient means to communicate feedback, on almost every aspect of the beer plus some, and if there's something else that I wanted to include I would provide some written comments in the extra space provided, which was the case for every beer that I judged in this year's final round.
IMO, the checklist format allows for more information to be communicated to the brewer, as opposed to the "written only" format which comes back with the comments and highlights of the beer. The checklist enables/directs the judge to review every aspect of the entry, as opposed to what's on the top of the judges mind.