Lumafusion will run fabulously on a new Air, and is a perfectly competent video editor. You won’t mistake it for FCPX or Premier but it’ll get the job mostly done (and provides FCPX export packages if desired). I started out using it as my iPad is my primary device, but I moved up to FCPX when I bought a Mac Mini M1. It’s actually very intuitive and the touch integrated design makes it a fun editor. I still use it sometimes for very quick jobs.