This needs to be upvoted. Lightworks is professional-grade video editing. No hand-holding or easy shortcuts, and the learning curve is very, very high. After years (probably over a decade) of using very amateurish video editing software, learning Lightworks was not easy, but I'm very glad I did. And having said that, I have a ton to learn.
I don't care if it's FOSS, and neither do any major studios. It's free for personal use and not terribly expensive to license.