Cause it doesn't really instantly mean that you need to just make flat terrain and that's it. The map still needs terrain consideration for quite a lot of stuff:
- When you build Anti-Air emplacements, any hills around them will disrupt their fire and block their vision, reducing their effectiveness. A perfect AA defense would involve a height gradient that goes down towards the enemy. On the contrary, if you surround the starting base with a huge terrain wall, it will give attackers quite a lot of advantage, as your AA defenses won't be able to see the enemy coming until a plasmite bomber is right on top of their heads.
- If oil derricks are spread out, the player may consider using mobile AA, usually on hovers. Then terrain controls how quickly your hovers will be able to move yourself around and react on attacks.
- Finally, if we expect transporters to work, it is necessary to design a few landing spots for them that should be easy enough to clean by the enemy, but not too easy to make it pointless to protect them in the first place.