Minimum requirements for Tippyverse?

[Coidzor]

I did actually. I'm not convinced that all the availability things work as you say. Especially if you don't assume that 9th level spells are easily findable and castable.

You can still do a fair bit with lower level casting, as I think 3-4th level spells do most of Eberron's stuff with 5th level ones being the upper end for most purposes.

It's...not particularly playable either at low levels or if you're not a caster. What I'm trying to do is a world where magic has an effect, without going "lol u suck peon" to every non-magical character in the world.

There's plenty of more traditional adventuring out in the wilds. Political intrigues don't operate solely on innate magical ability either. And there's all kinds of gladiatorial things in the more decadent ones.

I'm honestly not sure where you're going with this "lol u suck peon" thing, either or what you're really meaning. As has been said, caster superiority is based solely upon the classes, not the setting.