The downside—a very small one, in my mind—is that this is now the only way to get the individual Command and Conquer games on Steam. So if you wanted, for instance, Red Alert 3 or Tiberium ...
Tempest Rising is, according to the developers at Slipgate Ironworks, explicitly inspired by “RTS greats of the 90s and 2000s ...
such as the still-engaging Command and Conquer 3: Tiberium Wars and Red Alert 3. However, the previously Origin-exclusive Command and Conquer: The Ultimate Collection bundle is now on Steam ...