These researchers found that if you work from home you will be less efficient and productive than people who from their office. Can we say the same about freelance workers? Do you think that if workers are given the chance to "own" a task like freelancers they'll be more productive because it is just like being self-employed where you treat it as your business and not with the mindset of another man's business?
Not as always will you fulfill your work at the full 8 hours, sometimes you can easily do with the workload at least a 2-4 hours so people now will do nothing in the office or else they will seek more task just to prevent get nothing to do in their work station and will get noticed by their manager and supervisors, lets accept the fact that this always happens in work. Also those people in the work-from-home set up doesn't need to deal too much time for their transportation, breakfast, etc. which consumes time before the work time actually starts so sure they will less productive. But if you are kind of boss doesn't want to have an employee get idle I guess gives all the possible task into them and have a weekly report.