As the second best troop in the game, the Mortalen Conqueror needs to look effective, efficient, and deadly. Probably not as overly armed as the Boskaran, because Mortalens are all about maneuverability. That's their special thing. Their troops should reflect this. Goofy-looking weapons do not become them.
The Atuuk trooper, on the other hand, is a furry Ewok with a sharp stick. Lots of furry Ewoks with sharp sticks. An Atuuk is a critter that clearly believes in the fact that guns have this pesky habit of jamming, overheating, or running out of ammo, after which they become merely clumsy clubs. A spear has none of these problems.
Exactly, Mortalens should be like ninja lizards with things that slice and dice as well as guns that blow stuff up. That sounds pretty effective, efficent and deadly to me.
I am a bit disheartened to hear that in the year...well way in the future like, that guns are STILL jamming and overheating A spear can still break and what to an Ewok/Atuuk is a spear is a thumbtack to another race.