They haven't really added anything to Office since 2013, the last pre-subscription version. There were massive changes between Office 98 and 2013, including entirely new programs like OneNote. They just found a way to get their customers to rebuy the same product every year.
Same thing happened with Adobe and CS6; feature development slowed to a crawl after the change to a subscription.
Same thing happened with Adobe and CS6; feature development slowed to a crawl after the change to a subscription.