Excellent write-up!
It just shows how wrong they got the first order. It’s meant to be remnants of the Empire, surviving in the shadows on the rim, yet they have completely new:
armour.
guns.
space ships.
Heavy machinery (the gorilla AT-ATs etc).
Giant star killer far more powerful than the Empire at it’s height.
None of which makes sense for a remnant group - it should be a patch work of past things. The white details on their guns are just further examples of how out of place the first order is.
Definitely agree on your criteria for iconic blasters!