I feel like there should be some sort of limit towards daily turn-ins.

Diadem: Maybe a daily time allotment, and/or limit on material submissions; Umbral materials would need to give a bonus to prevent easily hitting a hard limit.

Crafting: This one would be a littler trickier to limit, I think. Even if you restrict the amount of daily turn-ins, crafters would still be able to cherry pick which tier(collectability) of expert craft to turn-in and reach a hard limit. Could add something that rotates a bonus for specific craft turn-in?

I was at the sidelines experiencing others grind their life away for ranking titles, and I believe preventing this unhealthy level of grinding would be a real treat.