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They don't want to be able to do the same work - they want to do the same work the exact same way using the exact same software.They don't merely want to the same work. They also want the best of class software. GIMP is not Photoshop by a large margin, for example. Ardur is too little to be compared to Logic or Cubase or ProTools (even without the issue of plugins). And so on...
>Same goes for video editing as well - there's kdenlive, OpenShot, DaVinci Resolve, Lightworks, and yes, even Blender can do it. But, nope. People want Premiere, Sony Vegas, and Final Cut - the rest doesn't even cross their mind.
No, many would be happy with DaVinci Resolve. But then they'd need many other parts of a video/post production workflow still not available on Linux in good form or any form.
It's not just "you're a videographer, you use Premiere on Windows, just switch to Davinci on Linux". Because I also e.g. might use AfterEffects, tons of video plugins not available on Linux, Photoshop and Audition for post-production work, several post production utilities, drivers for different peripherals I use for video, and so on. Oh, and plus all the saved presets and automations and such they've made for those.
DaVinci on Linux is great, but only solves a small (albeit core) part of the workflow.
Also, it's very understandable that professionals have invested in learning programs and constellations of programs.
Would a heavy Emacs user move to another platform that doesn't have Emacs - but offers e.g. Jove?
So it's not about unwillingness to move from Photoshop to say Gimp and Krita because they're "different". It's that Gimp and Krita are quite behind in several aspects, and that their presence only solves a small part of a professional (or hobbyist for that matter) workflow.