You've just listed why the "year of desktop Linux" is still forecast around 20.000 CE
1) Stupid application names which are not-marketable and in an era of search engines will flood you with thousands of irrelevant results.
2) Software fragmentation, compatibility issues, and bad UI libraries.
3) The movie industry has usually so much money, especially for big productions, they will use whatever fits their given needs better, or fits the "vision" of the leading people. You will find they use everything, and also have the money to customize whatever they use. Rendering is a pure computational task that doesn't need much on an UI. Guess anyway most preliminary work is made on Apple machines and Adobe software.... probably just because of the input hardware support.
That's completely different for most other business that have not that budget. If you're a freelance photographer, you need an application that works out of the box - you don't have tens of developers tailoring it to your needs.