not every implant has a purpose on the battlefield some are included for survival in difficult occasions like idk escaping from a cage, or eating difficult food hell space marines also extract the informations from a brain when they eat it but that doesn't mean it should be a ingame mechanic
I agree with this Being Helmetless as a (OPTION)Adding this would Add to Feel of the game But the spiting of Acid I think is something that should Done While useing CQC to Catch a Enamy off guard and to the effect of this Blinding would More effecting While still giveing the Enamy a Chance to fight even after being blinded At least they can still swing there weapon and Maybe giting a Lucky Hit in killing there foe
And can I ask you a question. DOES ANYBODY KNOW WHY THE HELL SPACE MARINE SEARGANTS DON'T USE HELMETS? It is impractikal as FUCK!