SCU RAS has been discussed many times. It's still a huge problem. SCUs just make too much mass and energy. It wouldn't be such a big deal if SCUs didn't also have incredible build power and a decent gun, giving them the ability to produce resources + build stuff + shoot enemies all in one.
Obviously, SCU RAS needs its effectiveness cut by 75%. Reduce RAS mass production to 3 to 5 per SCU and energy production to 200-300 per SCU.
Next, SCU base production should be reduced, too. 1-2 ass, 20-40 energy. No more.
Of course, if SCU RAS were completely eliminated, that would be cool, too. I don't see what it adds to the game.
Lastly, the quantum gate should cost more. 20,000 or more mass to make it an expensive late-game item would be nice.