[Chaos in a Can]

But, our transmission did... umm... never mind. XD

A shooter isn't necessarily more fragile than an arm.
I've seen multiple arms fall apart during a match, but many shooters, especially the mechanically simple ones like ours, would have to take quite a beating to break.
Breakdowns are also often caused by parts not specific to either shooters or arms. Problems in the drivetrain or electronics can easily leave you motionless on the field.