First Snow

There's a rule regarding necromancy:
Skeletons can only be raised using Basic Necromancy. If the Necromancy skill is Advanced or Expert, the raised skeletons must be dismissed immediately after the battle.

But we were offered different options for necromancy. Why did we have to choose such an uninspired one? Dismissing skeletons takes time, and you also have to keep track of the necromancer's skill level. And if the necromancer levels up twice, how many skeletons were raised at the basic level so that you can dismiss the excess? And if you leave one extra, will you be penalized? It would be much simpler to, for example, limit the necromancer to level 5, and then they wouldn't be able to fight. And what about a set of necromantic artifacts as a substitute for expert necromancy?