Normally sig, i would agree with you, but with all the standard glitter that the nids get right off the bat, I just can't support letting them have access to campaign refits.
How about turrets that can fire at all kinds of ordnance? and force a blast marker on almost any opponent they touch? (this used to murder eldar escorts in droves)
or perhaps, feeder tentacles that can cause instant damage and hit-and-runs, ignoring armor?
Giant claws that attack at full strength despite bracing for impact? and getting two attacks a round?
45cm batteries that cause fire crits?
the nids have plenty, and can still take the 90 pt massive claw cruiser.