Like the title says I would love if Terminator armor was added, at least just for PvE. My proposal justifying it's existence when we have heavy class is as follows:

 It would be slower than other classes, but wouldn't require getting into stance to shoot faster like heavy, ability would be charge in a straight line that would damage and stun enemies. Weapons would be:

-Melee: thunder hammer, power fist and power sword

-Ranged: storm bolter(maybe also cataphractii bolter like in Space Hulk deathwing with a bit different stats), assault cannon and flamer.

If any of the devs see this, please at least tell me if there are any plans even for way down the line to add terminator armor, all versions of it are my favorite Warhammer armors and it's sad to see that Thousand Sons have access to them, but we don't.