is that even immortals who do play morts are not a panacea for balance and they need to be careful because they take for granted the insider knowledge which the players don't have. Certain things will seem easier to them than they are to most of the playerbase.

We can't plan as efficiently because we barely know how edges interact with builds, and even if we did, there's still a zillion things we don't know about the workings of the game.