In the mentor system, it seems you can’t remove a skill if another skill that you created yourself depends on it, which is a shame! For example, I created True Luck, and then in the mentor system, I forgot about Logistics and instead put either Magic or Attack in its place! The old skill wheel seemed better. At least there was some variety between the factions, but now almost all factions have access to skills from other factions! But for upgrading artifacts, you don’t need many different skills, and there’s free space for other abilities!