Not sure exactly what your use case is, but I use vidcutter for lossless clip extraction and it works great and does not require Electron (it's QT based I believe). https://github.com/ozmartian/vidcutter
To answer a point that's been brought up elsewhere in the thread, one nice feature of vidcutter is that you can either cut fully losslessly (on keyframes) or cut frame-perfect while only encoding the frames before and after the first and last keyframes in the cut.
The Arch Linux package for vidcutter is only 4 MB. It has dependencies, of course, but I already have all of them installed for other things. (There's nothing uncommon.) All praise to dynamic linking.
Vidcutter is good but no where near as customizable as Losslesscut (specifically in terms of keybinds) and using the timeline is nowhere near as smooth. Its being developed in a way I approve of much more but I still prefer using Losslesscut by a large margin. If it ever catches up I'll be thrilled because I do like what its about a lot more but I don't really think it currently competes in terms of user experience. Still if it works well for you then there's a lot to appreciate.
To answer a point that's been brought up elsewhere in the thread, one nice feature of vidcutter is that you can either cut fully losslessly (on keyframes) or cut frame-perfect while only encoding the frames before and after the first and last keyframes in the cut.
The Arch Linux package for vidcutter is only 4 MB. It has dependencies, of course, but I already have all of them installed for other things. (There's nothing uncommon.) All praise to dynamic linking.