There are a few reasons, partly because of corporate policy which says no sensitive documents on cloud. Partly because I need to access stuff offline so prefer

There are a few reasons, partly because of corporate policy which says no sensitive documents on cloud. Partly because I need to access stuff offline so prefer to have a local copy. For example if I have to take my laptop travelling with between sites I may not have access to a internet connection. Your right that a large part is familiarity - we use Sharepoint (which I also hate) to share documents between teams rather than email.