Perhaps the poster was extreme in the use of "most", or perhaps not. But I think the Microsoft Word parallel is perfect here. Some people use Inkscape to create Vector graphics that they or others may want to open in vector form, which may be anywhere from few to most of the userbase, I don't really know (and I'm sure everybody posting here is assuming most people are using the software the same way they are using it). But there are plenty of other people, including myself, that use Inkscape to use the flexibility and power of vector graphics to create a final result that is not a vector, but is a piece of graphics or art that can be put to good use as a bitmap or pdf. Inkscape is indispensable for many people.