With Slack as a LMS the teaching will automatically shift from teacher-centred to a student-centred. Because being active is what you do in Slack — and being active is how students learn. So using Slack will give the students the ability to be active, to discuss and collaborate from the moment they login — under the supervision of a teacher.
Recent neuroscience confirms many of the things we sufferers of digital overload know innately. That successful multi-tasking is a myth. Multi-tasking makes us stupider. According to psychologist Glenn Wilson, the cognitive losses from multitasking are equivalent to smoking pot. (UPDATE: thanks to Liza Daly for pointing out that Glenn Wilson has publicly stated that this study was part of a paid PR gig, and misrepresented in the media. See: http://www.drglennwilson.com/Infomania_experiment_for_HP.doc)