( I'm posting on behalf of base takers and furballers)
Pros of having Terrain Ack:
-It would discourage vulching as players would have to Keep others on the ack and remember the spawn times, so when one comes back, they could take it out.
-It would encourage more strategy, especially on missions and NOE raids.
Cons of having terrain Ack:
-Low furballs are usually some of the best places to be on a map, as they usually offer the most enjoyment.
Terrain ack would give the defending side a advantage because of the auto ack, and would probably discourage people to start fights.
-Ack hugging would be very frequent and would encourage players to run to their side of the map.
-It's already a difficult to take a base, why make it harder?
I'm sure there are many more, but the consequences outweigh the benefits.