I use them where they’re representing salvaged weps rather than designed tech. After all there are two clear cut kinds of mechagnome: the ex city dwellers (in the resistance and former mechagonians) who probably apply careful design and invention into their tinkering and augmentation.
Then there are the “junkers” whom have got used to living in the heaps and make do with what they can and tweak it up. A little bit of suspension of belief is just needed for the fiery bits where they are. Most of my rusty MGs are junker or ex junker types.
Fortunately Mechagon offers most of the weapon types. Unfortunately two handers were missed off the techy look, as were daggers. This is why Uldir legacy will be awesome. Same for BoDA and Mekkatorques loots (gun and mace).
Just seems techy two handed axes, swords and maces are not really a thing, which is a shame. Two handed chainaxe would be amazing.