Sometimes that's the whole point of a army wide special rule or a racial rule. Weak and situational means it's not worth many points. And there is by no means a hard cap on armywide special rules.that kind of feels too weak across the army for an army wide special rule though bud
I'll admit, the no removing model on a roll of 1 is pretty weak. But the extra attack on a roll of 1 isn't too bad. Helps bigger units.
Might be a better rule for another army. I'm still in favor of the True Grit rule to replace sturdy for all dwarves.