I have always found it to be a bug in some ways. Imagine this: You are in a match with a single bot, and the monster reached stage 3. You, obviously, went to the relay to setup your defence. The monster is lurking in the distance, and as soon as it reaches the relay, you find out that Wasteland Maggie has domed the monster! In addition to it breaking your strategy, it gives the monster a huge chance to down someone because you will be stuck in a surprising dome. Sure, you can deactivate the dome, but you will have to wait for it to recharge, and the monster will have time to down a hunter and escape, regenerate armor, and comeback to do the same thing again.
I do not know if this has been discussed before, but I think it should be.