Taking into account TF can no longer create impassable terrain for light/assult, I see only 1 need for offensive TF.
Make a few cycles per tile to create mech/Hmech passable terrain.
TF can be used to create a small LOS bunker, but because it can't go beyond light/assault, it's effectiveness is probably not going to be worth the time.
So, a defensive force isn't going to need to sit behind the wall of mordor and delay an offensive force's push to open a door.
All the attacker will need to do is bring a few assaults, which will be able to make direct contact with the Ewar: and/or counter EW.