It's a video game, no need to be lore accurate nor do we have to stay within the confines of the MK10 Tacitus Primaris era of Space Marine armor. We need more First Born Armor, everybody wants it, haven't seen a single person who says they don't so hopefully we can get more in future updates or community events instead of slightly different variations of MK10 Tacitus stuff, some pics to show how awesome/iconic all this armor is and what most people would love to see in the game. 

Tbh I'd just like what we got in SM1 in terms of customization.