Adjudicating Magicians and Specialization Using Pathfinder.

[Michael Romes]

In 2e magicians were only able to access 2 schools for spells above 3rd level, so whereas a normal specialist lost 1 school, the magician lost 6...

I wrote "comparable specialist". A Mage specialized in one school is not comparable to the 2E Magician who specializes in two schools (Illusion/Divination). A double specialized Wizard would be closer to the Magician.
That is why I mentioned the Red Wizard of Thay as an comparable example of more limits with more power in specialization than the normal specialist.

And while a 2E specialist Wizard who specialize twice would lose 2 (or 3 or 4 depending on choice as e.g. an invoker lost Enchantment and Charm) complete schools of magic, the Magician retains up to level 2 of all schools. That sounds not great in all other D&D settings where magic is plenty and characters raise to high levels soon. But in Birthright where most of the population has no PC classes at all and most Magicians are lowlevel it is nice to have.