I still love the idea of our weapon levelling up with us. Have us receive the starter in an MSQ scene or a side quest at the beginning of the expansion, then have it tied to individual quests you open up as you progress through the zones. Have it tied to doing the unique fate chains in each zone (but tied to completion, not an RNG drop). Have every dungeon count towards it as we go through them. And then at 80, give us different challenges every tier. Even a set of them a la Wonderous Tales. Maybe completing a WT entry will also give you points towards your weapon as it learns from you, sees the world through your eyes. I don't understand how the Eureka slog means anything story-wise towards our weapons.