and preparation, necromancy, irresistible magic, etc. - all of this is a neutral school (or, in other words, a "special" school).
How can they not? What about shamans? What about goblin warlocks? What about the "Wrath of the Horde" spell? This is, of course, not standard magic, but it is still specific. Besides, an orc hero can cast spells on the map.
That's exactly it, it's not standard magic, and in fact, it's not magic at all. I repeat, it's a racial trait. In the same way, you could call the entire skill tree "specific magic" because it is closely intertwined with racial skills.