Despite what you may think, in the real world, no professional editor working on the real network show, a feature or a commercial etc would be using RAW images to edit with regardless of the power of their system. That is why the transcoded material is being delivered to the editors by DITs in the professional world.
In the US, there are very few network shows or features (particularly studio level features) that have editorial files made by the DIT. Most of them have a dailies vendor do that, in part because of the complexity of deliverables for a number of studios, in part to have a "real" colorist looking at the material and massaging it, in part to ensure proper archiving, and in part to get uploads to various vendors done in a reasonable time frame. The situation is different in other parts of the world, but in the US and Canada, that is the general approach.
And finally, based on your statement, please give me ONE example of Linux based NLE that is alive today? And, no, I don't mean some open source thingy, that someone keeping it alive in their spare time for some nostalgic reasons. No, I mean NLE, that is used to do some real work.
If you're talking about what we used to call "offline" editing, I agree (although as I recall Lightworks is available on Linux - not that most users of Lightworks are on that platform...). But if you're talking about conform and finishing, I would say that Flame Premium and Resolve both qualify (although admittedly a lot of Resolve seats are on Windows and Mac platforms).