I had Arch installed on my RPi2s, but I didn’t like the need to update the RPi that frequently, wearing off the SD card. And later on, it became unsupported by Arch ARM. Now I use DietPi, and it’s my favourite Linux distribution (for an SBC server) so far. It has very small number of processes running too). So that’s why I’m curious whether it would be much different with NetBSD.