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I think people get into the habit of presenting their software as uniquely capable. And wrapping up their own skills in that particular software. It is similar to a young programmer assuming that Perl (for example) is uniquely capable. In truth talent tends to transcend packages and other factors like ecosystem come in to play.

A talented CAD technician would be useful using pen and a drawing board. We are just not very good at selling those more inate qualities. It is just easier to just sell yourself as an AutoCAD driver.

Of course these sort of packages take a long time to learn, and you are much more productive using something you know. And people adapt their mental model to a particular package. So there is often little obvious point in changing software.