I'm not sure what "a modern approach" is, but iMovie and Luma Fusion are both pretty straightforward and unbloated from what I remember - and they both run on Mac. I'm not sure if either one has a lut editor, but 3d lut editor has been pretty good for a while now, hasn't it?
Shotcut (a free cross-platform NLE) might give some inspiration -- good clean UI which is intuitive to use if you just keep the dockable panels you really need:
https://shotcut.org/