I won't pretend to fully follow the maths back and forth in this ongoing debate/argument but a thought did occur to me regarding the usefulness of tracking total xp earned. That is, when a player cannot attend every session. If such a player only earns xp for sessions when they are present they will soon drop significantly behind others in character improvement.
Traditional class-based xp systems such as Saga can manage this by having everyone at the same xp value. With incremental point spend systems, such as L5R and this game a track needs to be kept so that a unfun disparity doesn't build up.
After all, not all roleplayers work traditional, easily planned around jobs.