Shotcut (on Linux at least) just doesn't work. I've used pretty much all amateur video-making software for Windows and some for Mac, Screenflow, FinalCut Pro, etc. The best by far is FinalCut Pro (Mac-only), because it automatically creates proxy files and allows you to edit everything in real time with no lag, even when adding complicated effects. The situation on Linux is dismal. The only good one is https://kdenli…
I recently used Lightworks on Linux. It worked fine. Quite a bit more powerful and hence complicated than the tools I used before. It's proprietary and the free as in beer version is limited to 720p mp4 ("YouTube") export, which was sufficient for my use case.
The content was super important stuff - early footage of many areas of the world not otherwise filmed - and was destined for Wikimedia Commons.
It was the worst experience I've ever had with commercial software since Windows 'corrected' an NTFS volume in ~2005 and nixxed the lot. From memory it was something to do with the input codec (beyond my control as lossless was a requirement), the output codec, and the aspect ratio. The software just couldn't cut the stuff. I was left to go back to ffmpeg and VLC. I will never again waste time learning a commercial UI.