Below is a recent post from another thread by @college1styr, a faculty member. To my mind, @college1styr does a great job of explaining the practical “pedagogical reasons” for the recent moves to temporary online:
This last point keeps getting lost in the discussion of whether these measures are useful in stop the spread. It isn’t just about stopping the spread, it is about providing the students with classes without disruption even when a substantial portion are unable to attend.