This one is more mechanical for me. I put a lot of effort into bringing my games alive. Worrying about every piddly XP point collected was just cognitive load wasted in my opinion. That was one less interesting map, or one fewer NPC to play, or a less interesting intriguing mystery placed before the players. Also, having mixed level parties was a total PITA. I either made the encoutner challenging for the top level player, thus making mincemeat out of the lower level ones, or the whole thing was a cake walk. The mix was like 1/3 right, 1/3 too easy, 1/3 TPK in waiting. With everyone on the same level, encoutner and adventure crafting bcame much more managable. (Interesting enough, PF2 made mixed level parties suicide by design!)