It could for a couple reasons.
1. In the story Della is killed presumably by something hitting the window from the outside (putting a hole in it and sucking anyone inside out).
Chainguns could be used to do something like this, where it does little damage to the building (self repairing window) but kills their colonists.
2. It would be great for units like scouts, earthworkers, surveyors because these units aren't armored at all.
Only issue I can see is the air cooling issue. Things on New Terra can't be aircooled very easily, simply because the atmosphere is very thin. There'd have to be active cooling of some sort, whether it be by refrigerant or whatever.