I suppose, at the very least, all sovereigns should get universal spells. So in addition to faction spell books (life and death) they also got generic spells so they could at least do a few nifty things. Of course, these would not be nearly as good as the specialized books but it would would allow for some balance between being almost overwhelmed with spells and not having any real spells at all (at least until researched well well into the game).

I agree a high level tech would be cool that delivers those spellbooks.

You might want to check out this mod, helps the fun a lot with the early game if you are playing a more caster centric sovereign.

https://forums.elementalgame.com/402601