Interesting Activision Statement

[Servius]

"I think people are misinterpretting that answer. It doesn't say "the combat advantage from terrain has been reduced". What it says is that "the terrain's fatigue impact on troops was reduced". i.e. Walking up hills and mountains doesn't exhaust your troops as quickly as it did in M:TW."

Reducing the fatigue caused by moving uphill, and increasing the rate at which fatigue is restored while resting DOES diminish the combat advantage of high ground because wearing an attacker out by forcing him to climb a big hill is a combat advantage. If the penalty is reduced and it's easier to recover from, the advantage is reduced.