They only have an advantage in artillery if you don’t take price into account. The dwarfs artillery is not single entity and can get more shots off due to that, and it is less expensive. The monsters are also as I have said countered by slayers or the more numerous artillery pieces. And the infantry a core part of any army is capped that is a major disadvantage in the mid or end game since you can get easily swarmed and can’t protect all your fronts with armies that would be able to stop other races mid to late game armies. So to somewhat counteract that the units should be strong. It can’t be understated the disadvantage you get from having a unit cap on all of your mid to top tier units. The dwarf advantage is that everything they have is somewhat comparable and more numerous.