The Mantis is a really fun vehicle to pilot but wouldn’t it be neat if we got to drive a variant for the covenant? or even one for the Prometheans? like the covenant variant has a storm rifle on th right side and a plasma caster on the left or the Promethean variant has a suppressor or a light rifle on the right side and a incineration cannon on the left.
There is no reason to have a duplicate for each vehicle for each faction. It’s much more important to make each vehicle feel unique and different compared to duplicating each vehicle.