I learned Najdorf and never felt that there was too much theory. I also like all of the variations. I understand it better than the Kan honestly as it's what I'm familiar with.
There are some ideas which are easy to understand in this Scheveningen structure where you have pressure against e4 by playing this setup with Be7, Nbd7, Qc7, b5, Bb7. There are ideas like b4 chasing away the c3 knight, Nbd7-Nc5, Rc8- Rxc3 positional sacrifice.
I've never felt that not knowing enough theory has hindered me at all as the opponents are the same. Understanding the ideas and why you play the moves is more important. Even a lot of the theoretical ideas are easy to understand when someone just explains it to you - and if you are willing to learn.
Lmao, all the sicilian haters come crawling out the woodwork.