The Mechanicus are my favorite faction in Warhammer 40k, yet for some reason there are rarely any games you can play as them that aren’t some kind of turn based strategy like the Mechanicus game. Given the large presence of Tech Priests and Magi in Darktide, as well as many maps being based around using servitors, manufacturing equipment, etc. I think a Mechanicus class would be PERFECT for the game whether it be a Tech Priest or Skitarii. It would also open the door to the Cult Mechanicum’s vast weaponry to add a breath of fresh air from the lasguns and bullets. You could make them a support oriented mage as a Tech Priest or a damage over time focused beast with the Skitarii and their radiation. Seeing how a Mechanicus would end up as a reject would also be insanely interesting! And the personalities could be a perfect addition to the cast and their banter.
All this to say FATSHARK!!! ADD A PLAYABLE MECHANICUS CLASS!!! AND MY LIFE.. IS YOURS!!