I'd like to get a general opinion – is it worth dividing the schools of magic into 6? What's your opinion, what are the possibilities for implementation, and if we leave chaos, darkness, light, and summoning, how can we distribute them more logically – TE without darkness and LE without summoning – that's nonsense.

In my opinion, we need to make one magic primary and the other secondary. Give everyone two schools of magic, except for mages – they can have a mix of three. If we want full symmetry, then two schools will suffice.

Then:

Humans - Light, Darkness.
Sylvan - Light, Summoning.
Mages - Summoning, Chaos.
Dungeon - Chaos, Darkness.
Necropolis - Darkness, Summoning.
Inferno - Chaos, secondary buffs and debuffs.
Stronghold - Shouts, sword magic, which is enhanced warrior progression.
Fortress - Light, Chaos. (They shouldn't just throw runes).

And that seems to work well.