Warrior: the iconic design, maw with legs
Tiger Warrior: oh shit, a bigger, stripy Warrior
Flying Bug: oh shit, it's a flying Warrior
Tanker bug: is that a Maybug with a flame thrower?
Plasma bug: oh, that's a non-flying firefly, but the glowy ass fires now
Brain bug: telepathic larvae, huh?
The rest: oh, so you took the previous three as license to just go "Earth bug, but big and shoots".
Green grasshoppers that only exist to be the ranged option in a melee army? Boring and annoying.
Giant scorpions that only exist to be the heavy ranged option in a melee army? Exceedingly boring and even more annoying as there's basically no way to kill one without taking casualties UNLESS you have a Marauder.