At that time it was. Lots of business process involved creating documents to be printed, sometimes manually signed, posted and microfilmed eventually. While a lot of internal stuff at corporations ran in computers, interactions between business entities, consumers and governments largely depended on dead-tree flows. Word processing was huge during the 80s and 90s because of that. Nowadays? Excel is what sells office subscriptions beyond the ones sold solely by inertia and brand, backwards compat and brand loyalty