PowerPoint wasn't the first though, was it? I remember Harvard Graphics and something from Lotus also?
One of the things I like about Google Workplace is it ended up stripping out a lot of the sort of cruft that Microsoft added over the years and ended up with components that are more streamlined for my generally fairly simple needs.
Not sure which of those had vector graphics in the same style as modern PowerPoint (Storyboard was bitmapped), and whether old PowerPoint already had vector graphics.
Harvard Graphics truly was horrible to work with. Very unintuitive. PowerPoint felt like a revelation in comparison.