@captain_crunch They are fighting rabid(?) beasts therefore loose formation would be best. They have already tried to fight in formation and it was easily broken by the horde. It is exactly same situation as with white walkers from GoT's last season - you are trying to stop living wall that is...
@Yautja They do have way superior technology and traning. In previous episoded they were able to deploy multiple illusions of themselves and their shielding spell is best there is.
@chucke1992 I like to think that Murata's version is like a translation from one language to another. He keeps the meaning and sometimes improves upon.