I suppose marketing people use Powerpoint/Excel graphs, etc., while in academics LaTEX equations, SPSS, MatLab, and so on are used to generate graphs. If I think about it, graphs are generally delivered to graphic designers/layout people, and hardly ever created by designers themselves. Or perhaps designers will beautify those graphs, but that would require a good design package, and is a custom job. Default graph tools just don't cut it then. Having a graph tool in InDesign would never satisfy the broad yet deep requirements for all users. And then how are you going to import advanced data? Too much of a hassle, and a hotbed for potential mistakes as well. Better to stick with the original source app, and generate graphs from there, controlled by the original author who knows the data. Leaving graph design to a designer is just too risky. Besides, graph tools such as the one in Illustrator are pretty limited anyway. And then there are occasional users who would rather just produce their graphs in Excel and export those. Or for free in software such as LibreOffice. So, no; I am not surprised. I believe this market to be smaller than it seems to be.
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