I'm gonna give you a semi-official answer to this too.
They refuse to add:
someghing that radically expands gameplay variability like changeable support tools, new classes, new types of enemies and so on.
something that radically expands gameplay depth, like haz 6, 7, new difuculty modifiers, 3,4 of them per mission.
meta change that shuffles meta from bottom to the head, thing I was using 2 years ago still exeptionally good.
Changeable support tools go against the design idea. We want the four classes to be dependable and recognizable through their support. What is the driller gonna do if you take his drill? We have four classes in a four player game - that is what the game is designed around. Adding a new class would mess up the balancing. Ever played an MMO when a new character comes out? There's be tons of games that would just be 4 x NewGuy, not to mention the amount of stuff we'd ...
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