What's the alternative?
Elven and Tevinter area 5 are only offering very small spaces where you can't move adequately and wipe easily or big open spaces where you get shot from all angles and wipe easily...
I don't remember which one it is (Elven or Tevinter), but there are 4 corners where you can defend relatively easily with only 2 small point of entry while the other is a nightmare because it's just wide open or so small your characters collide more than they should.
Orlais is the best map, it has a great protected area with a lot of room to move, but still that area is not always the same so it's also a lottery.
To make my point, when you played Hydra map in ME3 you had a big open area with only 1 great room to hide. 90% of the time everyone were hold up in that room. Why? Because it's the only safe place to avoid being shot from all angles and you have space to move if things gets hairy. It's simple like that.
To be fair, with a little coordination and skill, it's much easier to hold the entrance than any of the other options.