Good enough for me. Even if they didn't have them (that was way back in the first ed Epic too), there's no reason why they shouldn't. They're easily big enough, if a Falcon can have them then a Knight definately could.
Then again, Exodites may have some amish hate of holo-fields...
No matter. It's actually for a small online game I'm making (coming to a Website near you), I'll just leave it up to the players whether they use one or not.