I think you are not being clear with your terminology. Skills are things like entropy magic, one-handed, lockpicking, etc., and they are seen quite easily with the H key, no loading screens. Perhaps you are referring to the memories in the 3 discipline trees which you access through meditation, which does involve loading screens. You refer to "automatic skill progression" but there is no automatic skill progression, nor any automatic progression of memories. You also refer to "trainers" but Enderal doesn't have trainers. You ask what was their design philosophy? What difference does it make? Would knowing their design philosophy regarding skills (if there is one) make any difference whether you play the game or not? Also, regarding the memory trees, there is quite a bit behind them, but you won't learn that until you get deep into the main quest. I just don't get the point of your question.