I miss vis being incredibly precious and valuable.
I miss not understanding the rules, even after the eighth time through, and so having to give up and just going with something which was fun, optimising be damned.
I miss being able to write Latin, but not speak it, or vice versa.
I miss the king having a Divine Might higher than most angels.
I miss how covenant virtues and flaws were separate, and rather than balancing them, you needed to take a set number of each in a manner approaching solving the Knapsack Problem.
I miss how arguing with people taught you more than going to lectures.