The score and snap works better on 2mm than thinner plastics. I use 2mm and that's what I've shown in the video.
But hey, each to their own. I just showed how after 6 plus years of trimming armour how I have found the best cleanest quickest method that works for me. If power tools is your thing crack on. Everyman loves a power tool, I just don't think it's necessary for trimming armour. That's my point of view. You will all have your own favourite methods that work best for you.