I fail to understand what the reason for your frustration is. this is an Early access game. If they were to implement every available spell for levels 1-6 or 1-7 they would have to spend more resources balancing them right now for us, instead of working on the story,dialogue,narration, world building and other much more important aspects of the game. Think about it: if they would have implemented the things that you want, you would probably still be here, but instead of complaining about them not implementing more levels+spells, you would be complaining about how said spells are not properly implemented. I think you are frustrated with the situation because we lack a roadmap for the game itself. but then again, Larian is not creating an MMORpg, they are creating a CRPG, therefore they are not in any way obligated to show us their roadmap. Because then you would have people that would complain for things like : " why are they working on maps right now, and not on inventory management, or game mechanics, or whatever".
Maybe you wanted to see more spells but at the same time I understand that Larian is not on their first rodeo with this game, therefore I would imagine that they know best. After all, they are the developer, and we`re just some random customers that can barely wait for their product to release.