For video editing, proc and gpu are actually the important parts once you hit a certain point with ram and disk. Think about it, 4K videos in raw form are about 15gb per minute so you need a threshold of swapping and loading with ram and disk that allows you to move data in and out fast enough so the editing can be done in ram but you experience no lag as the user.
With disk in PCIe and a good controller you are getting around 1gb per second disk action so you have more than enough headroom.
With disk in PCIe and a good controller you are getting around 1gb per second disk action so you have more than enough headroom.