I see your point, but I don’t think that’s exactly why TRS buffed the monster. It wasn’t to force the monster to fight even at Stage 1, but more to ensure that if the monster gets domed at Stage 1 it still has a reasonable chance to fight back against the hunters.
And you totally can beat the Hunters at Stage 1; I’ve done it before. But I don’t see the fun in just immediately jumping them as they get out of the dropship. If I wanted that, I’d just play Arena and be done with it.